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author | Paul Osmialowski <p.osmialowsk@samsung.com> | 2015-04-17 18:42:26 +0200 |
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committer | Paul Osmialowski <p.osmialowsk@samsung.com> | 2015-04-17 19:02:58 +0200 |
commit | 8b8d02954ead87c1eb8db520e993a819efa868a3 (patch) | |
tree | 4d0b90c8c97627e21d9998a74247495c2287fd05 | |
parent | 6cf21dbb265781f320c06968ce0cc7a0fda6c964 (diff) | |
download | linux-3.10-8b8d02954ead87c1eb8db520e993a819efa868a3.tar.gz linux-3.10-8b8d02954ead87c1eb8db520e993a819efa868a3.tar.bz2 linux-3.10-8b8d02954ead87c1eb8db520e993a819efa868a3.zip |
fixed headers and other stuff
Change-Id: I66b1317be8ab3ba46c45f769e6a6e99942142842
Signed-off-by: Paul Osmialowski <p.osmialowsk@samsung.com>
-rw-r--r-- | compat/Makefile | 1 | ||||
-rw-r--r-- | compat/include/linux/err.h | 21 | ||||
-rw-r--r-- | compat/include/linux/fs.h | 2920 | ||||
-rw-r--r-- | compat/include/linux/list_lru.h | 189 | ||||
-rw-r--r-- | compat/include/linux/mm.h | 8 | ||||
-rw-r--r-- | compat/include/linux/pagemap.h | 18 | ||||
-rw-r--r-- | compat/include/linux/shrinker.h | 72 | ||||
-rw-r--r-- | compat/include/linux/uio.h | 135 | ||||
-rw-r--r-- | compat/mm/Makefile | 1 | ||||
-rw-r--r-- | compat/mm/truncate.c | 62 | ||||
-rw-r--r-- | include/linux/fs.h | 13 |
11 files changed, 132 insertions, 3308 deletions
diff --git a/compat/Makefile b/compat/Makefile index 4d550a1abfb..eb9bdc88439 100644 --- a/compat/Makefile +++ b/compat/Makefile @@ -2,4 +2,5 @@ ifdef CONFIG_KDBUS override LINUXINCLUDE := $(patsubst -Iinclude, -Icompat/include -Iinclude , $(LINUXINCLUDE)) obj-y += fs/ obj-y += lib/ +obj-y += mm/ endif diff --git a/compat/include/linux/err.h b/compat/include/linux/err.h new file mode 100644 index 00000000000..662c32b994e --- /dev/null +++ b/compat/include/linux/err.h @@ -0,0 +1,21 @@ +#ifndef __COMPAT_LINUX_ERR_H +#define __COMPAT_LINUX_ERR_H + +#include_next <linux/err.h> + +#ifndef __ASSEMBLY__ + +static inline int __must_check PTR_ERR_OR_ZERO(__force const void *ptr) +{ + if (IS_ERR(ptr)) + return PTR_ERR(ptr); + else + return 0; +} + +/* Deprecated */ +#define PTR_RET(p) PTR_ERR_OR_ZERO(p) + +#endif + +#endif /* _COMPAT_LINUX_ERR_H */ diff --git a/compat/include/linux/fs.h b/compat/include/linux/fs.h index 52cc4492cb3..cdb4dbc8931 100644 --- a/compat/include/linux/fs.h +++ b/compat/include/linux/fs.h @@ -1,2921 +1,9 @@ -#ifndef _LINUX_FS_H -#define _LINUX_FS_H +#ifndef _COMPAT_LINUX_FS_H +#define _COMPAT_LINUX_FS_H - -#include <linux/linkage.h> -#include <linux/wait.h> -#include <linux/kdev_t.h> -#include <linux/dcache.h> -#include <linux/path.h> -#include <linux/stat.h> -#include <linux/cache.h> -#include <linux/list.h> -#include <linux/list_lru.h> -#include <linux/llist.h> -#include <linux/radix-tree.h> -#include <linux/rbtree.h> -#include <linux/init.h> -#include <linux/pid.h> -#include <linux/bug.h> -#include <linux/mutex.h> -#include <linux/rwsem.h> -#include <linux/capability.h> -#include <linux/semaphore.h> -#include <linux/fiemap.h> -#include <linux/rculist_bl.h> -#include <linux/atomic.h> -#include <linux/shrinker.h> -#include <linux/migrate_mode.h> -#include <linux/uidgid.h> -#include <linux/lockdep.h> -#include <linux/percpu-rwsem.h> -#include <linux/blk_types.h> - -#include <asm/byteorder.h> -#include <uapi/linux/fs.h> - -struct backing_dev_info; -struct export_operations; -struct hd_geometry; -struct iovec; -struct nameidata; -struct kiocb; -struct kobject; -struct pipe_inode_info; -struct poll_table_struct; -struct kstatfs; -struct vm_area_struct; -struct vfsmount; -struct cred; -struct swap_info_struct; -struct seq_file; -struct workqueue_struct; -struct iov_iter; -struct vm_fault; - -extern void __init inode_init(void); -extern void __init inode_init_early(void); -extern void __init files_init(unsigned long); - -extern struct files_stat_struct files_stat; -extern unsigned long get_max_files(void); -extern int sysctl_nr_open; -extern struct inodes_stat_t inodes_stat; -extern int leases_enable, lease_break_time; -extern int sysctl_protected_symlinks; -extern int sysctl_protected_hardlinks; - -struct buffer_head; -typedef int (get_block_t)(struct inode *inode, sector_t iblock, - struct buffer_head *bh_result, int create); -typedef void (dio_iodone_t)(struct kiocb *iocb, loff_t offset, - ssize_t bytes, void *private); - -#define MAY_EXEC 0x00000001 -#define MAY_WRITE 0x00000002 -#define MAY_READ 0x00000004 -#define MAY_APPEND 0x00000008 -#define MAY_ACCESS 0x00000010 -#define MAY_OPEN 0x00000020 -#define MAY_CHDIR 0x00000040 -/* called from RCU mode, don't block */ -#define MAY_NOT_BLOCK 0x00000080 - -/* - * flags in file.f_mode. Note that FMODE_READ and FMODE_WRITE must correspond - * to O_WRONLY and O_RDWR via the strange trick in __dentry_open() - */ - -/* file is open for reading */ -#define FMODE_READ ((__force fmode_t)0x1) -/* file is open for writing */ -#define FMODE_WRITE ((__force fmode_t)0x2) -/* file is seekable */ -#define FMODE_LSEEK ((__force fmode_t)0x4) -/* file can be accessed using pread */ -#define FMODE_PREAD ((__force fmode_t)0x8) -/* file can be accessed using pwrite */ -#define FMODE_PWRITE ((__force fmode_t)0x10) -/* File is opened for execution with sys_execve / sys_uselib */ -#define FMODE_EXEC ((__force fmode_t)0x20) -/* File is opened with O_NDELAY (only set for block devices) */ -#define FMODE_NDELAY ((__force fmode_t)0x40) -/* File is opened with O_EXCL (only set for block devices) */ -#define FMODE_EXCL ((__force fmode_t)0x80) -/* File is opened using open(.., 3, ..) and is writeable only for ioctls - (specialy hack for floppy.c) */ -#define FMODE_WRITE_IOCTL ((__force fmode_t)0x100) -/* 32bit hashes as llseek() offset (for directories) */ -#define FMODE_32BITHASH ((__force fmode_t)0x200) -/* 64bit hashes as llseek() offset (for directories) */ -#define FMODE_64BITHASH ((__force fmode_t)0x400) - -/* - * Don't update ctime and mtime. - * - * Currently a special hack for the XFS open_by_handle ioctl, but we'll - * hopefully graduate it to a proper O_CMTIME flag supported by open(2) soon. - */ -#define FMODE_NOCMTIME ((__force fmode_t)0x800) - -/* Expect random access pattern */ -#define FMODE_RANDOM ((__force fmode_t)0x1000) - -/* File is huge (eg. /dev/kmem): treat loff_t as unsigned */ -#define FMODE_UNSIGNED_OFFSET ((__force fmode_t)0x2000) - -/* File is opened with O_PATH; almost nothing can be done with it */ -#define FMODE_PATH ((__force fmode_t)0x4000) - -/* File needs atomic accesses to f_pos */ -#define FMODE_ATOMIC_POS ((__force fmode_t)0x8000) -/* Write access to underlying fs */ -#define FMODE_WRITER ((__force fmode_t)0x10000) -/* Has read method(s) */ -#define FMODE_CAN_READ ((__force fmode_t)0x20000) -/* Has write method(s) */ -#define FMODE_CAN_WRITE ((__force fmode_t)0x40000) - -/* File was opened by fanotify and shouldn't generate fanotify events */ -#define FMODE_NONOTIFY ((__force fmode_t)0x4000000) - -/* - * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector - * that indicates that they should check the contents of the iovec are - * valid, but not check the memory that the iovec elements - * points too. - */ -#define CHECK_IOVEC_ONLY -1 - -/* - * The below are the various read and write types that we support. Some of - * them include behavioral modifiers that send information down to the - * block layer and IO scheduler. Terminology: - * - * The block layer uses device plugging to defer IO a little bit, in - * the hope that we will see more IO very shortly. This increases - * coalescing of adjacent IO and thus reduces the number of IOs we - * have to send to the device. It also allows for better queuing, - * if the IO isn't mergeable. If the caller is going to be waiting - * for the IO, then he must ensure that the device is unplugged so - * that the IO is dispatched to the driver. - * - * All IO is handled async in Linux. This is fine for background - * writes, but for reads or writes that someone waits for completion - * on, we want to notify the block layer and IO scheduler so that they - * know about it. That allows them to make better scheduling - * decisions. So when the below references 'sync' and 'async', it - * is referencing this priority hint. - * - * With that in mind, the available types are: - * - * READ A normal read operation. Device will be plugged. - * READ_SYNC A synchronous read. Device is not plugged, caller can - * immediately wait on this read without caring about - * unplugging. - * READA Used for read-ahead operations. Lower priority, and the - * block layer could (in theory) choose to ignore this - * request if it runs into resource problems. - * WRITE A normal async write. Device will be plugged. - * WRITE_SYNC Synchronous write. Identical to WRITE, but passes down - * the hint that someone will be waiting on this IO - * shortly. The write equivalent of READ_SYNC. - * WRITE_ODIRECT Special case write for O_DIRECT only. - * WRITE_FLUSH Like WRITE_SYNC but with preceding cache flush. - * WRITE_FUA Like WRITE_SYNC but data is guaranteed to be on - * non-volatile media on completion. - * WRITE_FLUSH_FUA Combination of WRITE_FLUSH and FUA. The IO is preceded - * by a cache flush and data is guaranteed to be on - * non-volatile media on completion. - * - */ -#define RW_MASK REQ_WRITE -#define RWA_MASK REQ_RAHEAD - -#define READ 0 -#define WRITE RW_MASK -#define READA RWA_MASK - -#define READ_SYNC (READ | REQ_SYNC) -#define WRITE_SYNC (WRITE | REQ_SYNC | REQ_NOIDLE) -#define WRITE_ODIRECT (WRITE | REQ_SYNC) -#define WRITE_FLUSH (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH) -#define WRITE_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FUA) -#define WRITE_FLUSH_FUA (WRITE | REQ_SYNC | REQ_NOIDLE | REQ_FLUSH | REQ_FUA) - -/* - * Attribute flags. These should be or-ed together to figure out what - * has been changed! - */ -#define ATTR_MODE (1 << 0) -#define ATTR_UID (1 << 1) -#define ATTR_GID (1 << 2) -#define ATTR_SIZE (1 << 3) -#define ATTR_ATIME (1 << 4) -#define ATTR_MTIME (1 << 5) -#define ATTR_CTIME (1 << 6) -#define ATTR_ATIME_SET (1 << 7) -#define ATTR_MTIME_SET (1 << 8) -#define ATTR_FORCE (1 << 9) /* Not a change, but a change it */ -#define ATTR_ATTR_FLAG (1 << 10) -#define ATTR_KILL_SUID (1 << 11) -#define ATTR_KILL_SGID (1 << 12) -#define ATTR_FILE (1 << 13) -#define ATTR_KILL_PRIV (1 << 14) -#define ATTR_OPEN (1 << 15) /* Truncating from open(O_TRUNC) */ -#define ATTR_TIMES_SET (1 << 16) - -/* - * Whiteout is represented by a char device. The following constants define the - * mode and device number to use. - */ -#define WHITEOUT_MODE 0 -#define WHITEOUT_DEV 0 - -/* - * This is the Inode Attributes structure, used for notify_change(). It - * uses the above definitions as flags, to know which values have changed. - * Also, in this manner, a Filesystem can look at only the values it cares - * about. Basically, these are the attributes that the VFS layer can - * request to change from the FS layer. - * - * Derek Atkins <warlord@MIT.EDU> 94-10-20 - */ -struct iattr { - unsigned int ia_valid; - umode_t ia_mode; - kuid_t ia_uid; - kgid_t ia_gid; - loff_t ia_size; - struct timespec ia_atime; - struct timespec ia_mtime; - struct timespec ia_ctime; - - /* - * Not an attribute, but an auxiliary info for filesystems wanting to - * implement an ftruncate() like method. NOTE: filesystem should - * check for (ia_valid & ATTR_FILE), and not for (ia_file != NULL). - */ - struct file *ia_file; -}; - -/* - * Includes for diskquotas. - */ -#include <linux/quota.h> - -/* - * Maximum number of layers of fs stack. Needs to be limited to - * prevent kernel stack overflow - */ -#define FILESYSTEM_MAX_STACK_DEPTH 2 - -/** - * enum positive_aop_returns - aop return codes with specific semantics - * - * @AOP_WRITEPAGE_ACTIVATE: Informs the caller that page writeback has - * completed, that the page is still locked, and - * should be considered active. The VM uses this hint - * to return the page to the active list -- it won't - * be a candidate for writeback again in the near - * future. Other callers must be careful to unlock - * the page if they get this return. Returned by - * writepage(); - * - * @AOP_TRUNCATED_PAGE: The AOP method that was handed a locked page has - * unlocked it and the page might have been truncated. - * The caller should back up to acquiring a new page and - * trying again. The aop will be taking reasonable - * precautions not to livelock. If the caller held a page - * reference, it should drop it before retrying. Returned - * by readpage(). - * - * address_space_operation functions return these large constants to indicate - * special semantics to the caller. These are much larger than the bytes in a - * page to allow for functions that return the number of bytes operated on in a - * given page. - */ - -enum positive_aop_returns { - AOP_WRITEPAGE_ACTIVATE = 0x80000, - AOP_TRUNCATED_PAGE = 0x80001, -}; - -#define AOP_FLAG_UNINTERRUPTIBLE 0x0001 /* will not do a short write */ -#define AOP_FLAG_CONT_EXPAND 0x0002 /* called from cont_expand */ -#define AOP_FLAG_NOFS 0x0004 /* used by filesystem to direct - * helper code (eg buffer layer) - * to clear GFP_FS from alloc */ - -/* - * oh the beauties of C type declarations. - */ -struct page; -struct address_space; -struct writeback_control; - -/* - * "descriptor" for what we're up to with a read. - * This allows us to use the same read code yet - * have multiple different users of the data that - * we read from a file. - * - * The simplest case just copies the data to user - * mode. - */ -typedef struct { - size_t written; - size_t count; - union { - char __user *buf; - void *data; - } arg; - int error; -} read_descriptor_t; - -typedef int (*read_actor_t)(read_descriptor_t *, struct page *, - unsigned long, unsigned long); - -struct address_space_operations { - int (*writepage)(struct page *page, struct writeback_control *wbc); - int (*readpage)(struct file *, struct page *); - - /* Write back some dirty pages from this mapping. */ - int (*writepages)(struct address_space *, struct writeback_control *); - - /* Set a page dirty. Return true if this dirtied it */ - int (*set_page_dirty)(struct page *page); - - int (*readpages)(struct file *filp, struct address_space *mapping, - struct list_head *pages, unsigned nr_pages); - - int (*write_begin)(struct file *, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata); - int (*write_end)(struct file *, struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *page, void *fsdata); - - /* Unfortunately this kludge is needed for FIBMAP. Don't use it */ - sector_t (*bmap)(struct address_space *, sector_t); - void (*invalidatepage) (struct page *, unsigned int, unsigned int); - int (*releasepage) (struct page *, gfp_t); - void (*freepage)(struct page *); - ssize_t (*direct_IO)(int, struct kiocb *, struct iov_iter *iter, loff_t offset); - /* - * migrate the contents of a page to the specified target. If - * migrate_mode is MIGRATE_ASYNC, it must not block. - */ - int (*migratepage) (struct address_space *, - struct page *, struct page *, enum migrate_mode); - int (*launder_page) (struct page *); - int (*is_partially_uptodate) (struct page *, unsigned long, - unsigned long); - void (*is_dirty_writeback) (struct page *, bool *, bool *); - int (*error_remove_page)(struct address_space *, struct page *); - - /* swapfile support */ - int (*swap_activate)(struct swap_info_struct *sis, struct file *file, - sector_t *span); - void (*swap_deactivate)(struct file *file); -}; - -extern const struct address_space_operations empty_aops; - -/* - * pagecache_write_begin/pagecache_write_end must be used by general code - * to write into the pagecache. - */ -int pagecache_write_begin(struct file *, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata); - -int pagecache_write_end(struct file *, struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *page, void *fsdata); - -struct address_space { - struct inode *host; /* owner: inode, block_device */ - struct radix_tree_root page_tree; /* radix tree of all pages */ - spinlock_t tree_lock; /* and lock protecting it */ - atomic_t i_mmap_writable;/* count VM_SHARED mappings */ - struct rb_root i_mmap; /* tree of private and shared mappings */ - struct rw_semaphore i_mmap_rwsem; /* protect tree, count, list */ - /* Protected by tree_lock together with the radix tree */ - unsigned long nrpages; /* number of total pages */ - unsigned long nrshadows; /* number of shadow entries */ - pgoff_t writeback_index;/* writeback starts here */ - const struct address_space_operations *a_ops; /* methods */ - unsigned long flags; /* error bits/gfp mask */ - spinlock_t private_lock; /* for use by the address_space */ - struct list_head private_list; /* ditto */ - void *private_data; /* ditto */ -} __attribute__((aligned(sizeof(long)))); - /* - * On most architectures that alignment is already the case; but - * must be enforced here for CRIS, to let the least significant bit - * of struct page's "mapping" pointer be used for PAGE_MAPPING_ANON. - */ -struct request_queue; - -struct block_device { - dev_t bd_dev; /* not a kdev_t - it's a search key */ - int bd_openers; - struct inode * bd_inode; /* will die */ - struct super_block * bd_super; - struct mutex bd_mutex; /* open/close mutex */ - struct list_head bd_inodes; - void * bd_claiming; - void * bd_holder; - int bd_holders; - bool bd_write_holder; -#ifdef CONFIG_SYSFS - struct list_head bd_holder_disks; -#endif - struct block_device * bd_contains; - unsigned bd_block_size; - struct hd_struct * bd_part; - /* number of times partitions within this device have been opened. */ - unsigned bd_part_count; - int bd_invalidated; - struct gendisk * bd_disk; - struct request_queue * bd_queue; - struct list_head bd_list; - /* - * Private data. You must have bd_claim'ed the block_device - * to use this. NOTE: bd_claim allows an owner to claim - * the same device multiple times, the owner must take special - * care to not mess up bd_private for that case. - */ - unsigned long bd_private; - - /* The counter of freeze processes */ - int bd_fsfreeze_count; - /* Mutex for freeze */ - struct mutex bd_fsfreeze_mutex; -}; - -/* - * Radix-tree tags, for tagging dirty and writeback pages within the pagecache - * radix trees - */ -#define PAGECACHE_TAG_DIRTY 0 -#define PAGECACHE_TAG_WRITEBACK 1 -#define PAGECACHE_TAG_TOWRITE 2 - -int mapping_tagged(struct address_space *mapping, int tag); - -static inline void i_mmap_lock_write(struct address_space *mapping) -{ - down_write(&mapping->i_mmap_rwsem); -} - -static inline void i_mmap_unlock_write(struct address_space *mapping) -{ - up_write(&mapping->i_mmap_rwsem); -} - -static inline void i_mmap_lock_read(struct address_space *mapping) -{ - down_read(&mapping->i_mmap_rwsem); -} - -static inline void i_mmap_unlock_read(struct address_space *mapping) -{ - up_read(&mapping->i_mmap_rwsem); -} - -/* - * Might pages of this file be mapped into userspace? - */ -static inline int mapping_mapped(struct address_space *mapping) -{ - return !RB_EMPTY_ROOT(&mapping->i_mmap); -} - -/* - * Might pages of this file have been modified in userspace? - * Note that i_mmap_writable counts all VM_SHARED vmas: do_mmap_pgoff - * marks vma as VM_SHARED if it is shared, and the file was opened for - * writing i.e. vma may be mprotected writable even if now readonly. - * - * If i_mmap_writable is negative, no new writable mappings are allowed. You - * can only deny writable mappings, if none exists right now. - */ -static inline int mapping_writably_mapped(struct address_space *mapping) -{ - return atomic_read(&mapping->i_mmap_writable) > 0; -} - -static inline int mapping_map_writable(struct address_space *mapping) -{ - return atomic_inc_unless_negative(&mapping->i_mmap_writable) ? - 0 : -EPERM; -} - -static inline void mapping_unmap_writable(struct address_space *mapping) -{ - atomic_dec(&mapping->i_mmap_writable); -} - -static inline int mapping_deny_writable(struct address_space *mapping) -{ - return atomic_dec_unless_positive(&mapping->i_mmap_writable) ? - 0 : -EBUSY; -} - -static inline void mapping_allow_writable(struct address_space *mapping) -{ - atomic_inc(&mapping->i_mmap_writable); -} - -/* - * Use sequence counter to get consistent i_size on 32-bit processors. - */ -#if BITS_PER_LONG==32 && defined(CONFIG_SMP) -#include <linux/seqlock.h> -#define __NEED_I_SIZE_ORDERED -#define i_size_ordered_init(inode) seqcount_init(&inode->i_size_seqcount) -#else -#define i_size_ordered_init(inode) do { } while (0) -#endif - -struct posix_acl; -#define ACL_NOT_CACHED ((void *)(-1)) - -#define IOP_FASTPERM 0x0001 -#define IOP_LOOKUP 0x0002 -#define IOP_NOFOLLOW 0x0004 - -/* - * Keep mostly read-only and often accessed (especially for - * the RCU path lookup and 'stat' data) fields at the beginning - * of the 'struct inode' - */ -struct inode { - umode_t i_mode; - unsigned short i_opflags; - kuid_t i_uid; - kgid_t i_gid; - unsigned int i_flags; - -#ifdef CONFIG_FS_POSIX_ACL - struct posix_acl *i_acl; - struct posix_acl *i_default_acl; -#endif - - const struct inode_operations *i_op; - struct super_block *i_sb; - struct address_space *i_mapping; - -#ifdef CONFIG_SECURITY - void *i_security; -#endif - - /* Stat data, not accessed from path walking */ - unsigned long i_ino; - /* - * Filesystems may only read i_nlink directly. They shall use the - * following functions for modification: - * - * (set|clear|inc|drop)_nlink - * inode_(inc|dec)_link_count - */ - union { - const unsigned int i_nlink; - unsigned int __i_nlink; - }; - dev_t i_rdev; - loff_t i_size; - struct timespec i_atime; - struct timespec i_mtime; - struct timespec i_ctime; - spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */ - unsigned short i_bytes; - unsigned int i_blkbits; - blkcnt_t i_blocks; - -#ifdef __NEED_I_SIZE_ORDERED - seqcount_t i_size_seqcount; -#endif - - /* Misc */ - unsigned long i_state; - struct mutex i_mutex; - - unsigned long dirtied_when; /* jiffies of first dirtying */ - unsigned long dirtied_time_when; - - struct hlist_node i_hash; - struct list_head i_wb_list; /* backing dev IO list */ - struct list_head i_lru; /* inode LRU list */ - struct list_head i_sb_list; - union { - struct hlist_head i_dentry; - struct rcu_head i_rcu; - }; - u64 i_version; - atomic_t i_count; - atomic_t i_dio_count; - atomic_t i_writecount; -#ifdef CONFIG_IMA - atomic_t i_readcount; /* struct files open RO */ -#endif - const struct file_operations *i_fop; /* former ->i_op->default_file_ops */ - struct file_lock_context *i_flctx; - struct address_space i_data; - struct list_head i_devices; - union { - struct pipe_inode_info *i_pipe; - struct block_device *i_bdev; - struct cdev *i_cdev; - }; - - __u32 i_generation; - -#ifdef CONFIG_FSNOTIFY - __u32 i_fsnotify_mask; /* all events this inode cares about */ - struct hlist_head i_fsnotify_marks; -#endif - - void *i_private; /* fs or device private pointer */ -}; - -static inline int inode_unhashed(struct inode *inode) -{ - return hlist_unhashed(&inode->i_hash); -} - -/* - * inode->i_mutex nesting subclasses for the lock validator: - * - * 0: the object of the current VFS operation - * 1: parent - * 2: child/target - * 3: xattr - * 4: second non-directory - * 5: second parent (when locking independent directories in rename) - * - * I_MUTEX_NONDIR2 is for certain operations (such as rename) which lock two - * non-directories at once. - * - * The locking order between these classes is - * parent[2] -> child -> grandchild -> normal -> xattr -> second non-directory - */ -enum inode_i_mutex_lock_class -{ - I_MUTEX_NORMAL, - I_MUTEX_PARENT, - I_MUTEX_CHILD, - I_MUTEX_XATTR, - I_MUTEX_NONDIR2, - I_MUTEX_PARENT2, -}; - -void lock_two_nondirectories(struct inode *, struct inode*); -void unlock_two_nondirectories(struct inode *, struct inode*); - -/* - * NOTE: in a 32bit arch with a preemptable kernel and - * an UP compile the i_size_read/write must be atomic - * with respect to the local cpu (unlike with preempt disabled), - * but they don't need to be atomic with respect to other cpus like in - * true SMP (so they need either to either locally disable irq around - * the read or for example on x86 they can be still implemented as a - * cmpxchg8b without the need of the lock prefix). For SMP compiles - * and 64bit archs it makes no difference if preempt is enabled or not. - */ -static inline loff_t i_size_read(const struct inode *inode) -{ -#if BITS_PER_LONG==32 && defined(CONFIG_SMP) - loff_t i_size; - unsigned int seq; - - do { - seq = read_seqcount_begin(&inode->i_size_seqcount); - i_size = inode->i_size; - } while (read_seqcount_retry(&inode->i_size_seqcount, seq)); - return i_size; -#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) - loff_t i_size; - - preempt_disable(); - i_size = inode->i_size; - preempt_enable(); - return i_size; -#else - return inode->i_size; -#endif -} - -/* - * NOTE: unlike i_size_read(), i_size_write() does need locking around it - * (normally i_mutex), otherwise on 32bit/SMP an update of i_size_seqcount - * can be lost, resulting in subsequent i_size_read() calls spinning forever. - */ -static inline void i_size_write(struct inode *inode, loff_t i_size) -{ -#if BITS_PER_LONG==32 && defined(CONFIG_SMP) - preempt_disable(); - write_seqcount_begin(&inode->i_size_seqcount); - inode->i_size = i_size; - write_seqcount_end(&inode->i_size_seqcount); - preempt_enable(); -#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT) - preempt_disable(); - inode->i_size = i_size; - preempt_enable(); -#else - inode->i_size = i_size; -#endif -} - -/* Helper functions so that in most cases filesystems will - * not need to deal directly with kuid_t and kgid_t and can - * instead deal with the raw numeric values that are stored - * in the filesystem. - */ -static inline uid_t i_uid_read(const struct inode *inode) -{ - return from_kuid(&init_user_ns, inode->i_uid); -} - -static inline gid_t i_gid_read(const struct inode *inode) -{ - return from_kgid(&init_user_ns, inode->i_gid); -} - -static inline void i_uid_write(struct inode *inode, uid_t uid) -{ - inode->i_uid = make_kuid(&init_user_ns, uid); -} - -static inline void i_gid_write(struct inode *inode, gid_t gid) -{ - inode->i_gid = make_kgid(&init_user_ns, gid); -} - -static inline unsigned iminor(const struct inode *inode) -{ - return MINOR(inode->i_rdev); -} - -static inline unsigned imajor(const struct inode *inode) -{ - return MAJOR(inode->i_rdev); -} - -extern struct block_device *I_BDEV(struct inode *inode); - -struct fown_struct { - rwlock_t lock; /* protects pid, uid, euid fields */ - struct pid *pid; /* pid or -pgrp where SIGIO should be sent */ - enum pid_type pid_type; /* Kind of process group SIGIO should be sent to */ - kuid_t uid, euid; /* uid/euid of process setting the owner */ - int signum; /* posix.1b rt signal to be delivered on IO */ -}; - -/* - * Track a single file's readahead state - */ -struct file_ra_state { - pgoff_t start; /* where readahead started */ - unsigned int size; /* # of readahead pages */ - unsigned int async_size; /* do asynchronous readahead when - there are only # of pages ahead */ - - unsigned int ra_pages; /* Maximum readahead window */ - unsigned int mmap_miss; /* Cache miss stat for mmap accesses */ - loff_t prev_pos; /* Cache last read() position */ -}; - -/* - * Check if @index falls in the readahead windows. - */ -static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index) -{ - return (index >= ra->start && - index < ra->start + ra->size); -} - -struct file { - union { - struct llist_node fu_llist; - struct rcu_head fu_rcuhead; - } f_u; - struct path f_path; - struct inode *f_inode; /* cached value */ - const struct file_operations *f_op; - - /* - * Protects f_ep_links, f_flags. - * Must not be taken from IRQ context. - */ - spinlock_t f_lock; - atomic_long_t f_count; - unsigned int f_flags; - fmode_t f_mode; - struct mutex f_pos_lock; - loff_t f_pos; - struct fown_struct f_owner; - const struct cred *f_cred; - struct file_ra_state f_ra; - - u64 f_version; -#ifdef CONFIG_SECURITY - void *f_security; -#endif - /* needed for tty driver, and maybe others */ - void *private_data; - -#ifdef CONFIG_EPOLL - /* Used by fs/eventpoll.c to link all the hooks to this file */ - struct list_head f_ep_links; - struct list_head f_tfile_llink; -#endif /* #ifdef CONFIG_EPOLL */ - struct address_space *f_mapping; -} __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */ - -struct file_handle { - __u32 handle_bytes; - int handle_type; - /* file identifier */ - unsigned char f_handle[0]; -}; - -static inline struct file *get_file(struct file *f) -{ - atomic_long_inc(&f->f_count); - return f; -} -#define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1) -#define file_count(x) atomic_long_read(&(x)->f_count) - -#define MAX_NON_LFS ((1UL<<31) - 1) - -/* Page cache limit. The filesystems should put that into their s_maxbytes - limits, otherwise bad things can happen in VM. */ -#if BITS_PER_LONG==32 -#define MAX_LFS_FILESIZE (((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) -#elif BITS_PER_LONG==64 -#define MAX_LFS_FILESIZE ((loff_t)0x7fffffffffffffffLL) -#endif - -#define FL_POSIX 1 -#define FL_FLOCK 2 -#define FL_DELEG 4 /* NFSv4 delegation */ -#define FL_ACCESS 8 /* not trying to lock, just looking */ -#define FL_EXISTS 16 /* when unlocking, test for existence */ -#define FL_LEASE 32 /* lease held on this file */ -#define FL_CLOSE 64 /* unlock on close */ -#define FL_SLEEP 128 /* A blocking lock */ -#define FL_DOWNGRADE_PENDING 256 /* Lease is being downgraded */ -#define FL_UNLOCK_PENDING 512 /* Lease is being broken */ -#define FL_OFDLCK 1024 /* lock is "owned" by struct file */ -#define FL_LAYOUT 2048 /* outstanding pNFS layout */ - -/* - * Special return value from posix_lock_file() and vfs_lock_file() for - * asynchronous locking. - */ -#define FILE_LOCK_DEFERRED 1 - -/* legacy typedef, should eventually be removed */ -typedef void *fl_owner_t; - -struct file_lock; - -struct file_lock_operations { - void (*fl_copy_lock)(struct file_lock *, struct file_lock *); - void (*fl_release_private)(struct file_lock *); -}; - -struct lock_manager_operations { - int (*lm_compare_owner)(struct file_lock *, struct file_lock *); - unsigned long (*lm_owner_key)(struct file_lock *); - void (*lm_get_owner)(struct file_lock *, struct file_lock *); - void (*lm_put_owner)(struct file_lock *); - void (*lm_notify)(struct file_lock *); /* unblock callback */ - int (*lm_grant)(struct file_lock *, int); - bool (*lm_break)(struct file_lock *); - int (*lm_change)(struct file_lock *, int, struct list_head *); - void (*lm_setup)(struct file_lock *, void **); -}; - -struct lock_manager { - struct list_head list; -}; - -struct net; -void locks_start_grace(struct net *, struct lock_manager *); -void locks_end_grace(struct lock_manager *); -int locks_in_grace(struct net *); - -/* that will die - we need it for nfs_lock_info */ -#include <linux/nfs_fs_i.h> - -/* - * struct file_lock represents a generic "file lock". It's used to represent - * POSIX byte range locks, BSD (flock) locks, and leases. It's important to - * note that the same struct is used to represent both a request for a lock and - * the lock itself, but the same object is never used for both. - * - * FIXME: should we create a separate "struct lock_request" to help distinguish - * these two uses? - * - * The varous i_flctx lists are ordered by: - * - * 1) lock owner - * 2) lock range start - * 3) lock range end - * - * Obviously, the last two criteria only matter for POSIX locks. - */ -struct file_lock { - struct file_lock *fl_next; /* singly linked list for this inode */ - struct list_head fl_list; /* link into file_lock_context */ - struct hlist_node fl_link; /* node in global lists */ - struct list_head fl_block; /* circular list of blocked processes */ - fl_owner_t fl_owner; - unsigned int fl_flags; - unsigned char fl_type; - unsigned int fl_pid; - int fl_link_cpu; /* what cpu's list is this on? */ - struct pid *fl_nspid; - wait_queue_head_t fl_wait; - struct file *fl_file; - loff_t fl_start; - loff_t fl_end; - - struct fasync_struct * fl_fasync; /* for lease break notifications */ - /* for lease breaks: */ - unsigned long fl_break_time; - unsigned long fl_downgrade_time; - - const struct file_lock_operations *fl_ops; /* Callbacks for filesystems */ - const struct lock_manager_operations *fl_lmops; /* Callbacks for lockmanagers */ - union { - struct nfs_lock_info nfs_fl; - struct nfs4_lock_info nfs4_fl; - struct { - struct list_head link; /* link in AFS vnode's pending_locks list */ - int state; /* state of grant or error if -ve */ - } afs; - } fl_u; -}; - -struct file_lock_context { - spinlock_t flc_lock; - struct list_head flc_flock; - struct list_head flc_posix; - struct list_head flc_lease; -}; - -/* The following constant reflects the upper bound of the file/locking space */ -#ifndef OFFSET_MAX -#define INT_LIMIT(x) (~((x)1 << (sizeof(x)*8 - 1))) -#define OFFSET_MAX INT_LIMIT(loff_t) -#define OFFT_OFFSET_MAX INT_LIMIT(off_t) -#endif - -#include <linux/fcntl.h> - -extern void send_sigio(struct fown_struct *fown, int fd, int band); - -#ifdef CONFIG_FILE_LOCKING -extern int fcntl_getlk(struct file *, unsigned int, struct flock __user *); -extern int fcntl_setlk(unsigned int, struct file *, unsigned int, - struct flock __user *); - -#if BITS_PER_LONG == 32 -extern int fcntl_getlk64(struct file *, unsigned int, struct flock64 __user *); -extern int fcntl_setlk64(unsigned int, struct file *, unsigned int, - struct flock64 __user *); -#endif - -extern int fcntl_setlease(unsigned int fd, struct file *filp, long arg); -extern int fcntl_getlease(struct file *filp); - -/* fs/locks.c */ -void locks_free_lock_context(struct file_lock_context *ctx); -void locks_free_lock(struct file_lock *fl); -extern void locks_init_lock(struct file_lock *); -extern struct file_lock * locks_alloc_lock(void); -extern void locks_copy_lock(struct file_lock *, struct file_lock *); -extern void locks_copy_conflock(struct file_lock *, struct file_lock *); -extern void locks_remove_posix(struct file *, fl_owner_t); -extern void locks_remove_file(struct file *); -extern void locks_release_private(struct file_lock *); -extern void posix_test_lock(struct file *, struct file_lock *); -extern int posix_lock_file(struct file *, struct file_lock *, struct file_lock *); -extern int posix_lock_file_wait(struct file *, struct file_lock *); -extern int posix_unblock_lock(struct file_lock *); -extern int vfs_test_lock(struct file *, struct file_lock *); -extern int vfs_lock_file(struct file *, unsigned int, struct file_lock *, struct file_lock *); -extern int vfs_cancel_lock(struct file *filp, struct file_lock *fl); -extern int flock_lock_file_wait(struct file *filp, struct file_lock *fl); -extern int __break_lease(struct inode *inode, unsigned int flags, unsigned int type); -extern void lease_get_mtime(struct inode *, struct timespec *time); -extern int generic_setlease(struct file *, long, struct file_lock **, void **priv); -extern int vfs_setlease(struct file *, long, struct file_lock **, void **); -extern int lease_modify(struct file_lock *, int, struct list_head *); -#else /* !CONFIG_FILE_LOCKING */ -static inline int fcntl_getlk(struct file *file, unsigned int cmd, - struct flock __user *user) -{ - return -EINVAL; -} - -static inline int fcntl_setlk(unsigned int fd, struct file *file, - unsigned int cmd, struct flock __user *user) -{ - return -EACCES; -} - -#if BITS_PER_LONG == 32 -static inline int fcntl_getlk64(struct file *file, unsigned int cmd, - struct flock64 __user *user) -{ - return -EINVAL; -} - -static inline int fcntl_setlk64(unsigned int fd, struct file *file, - unsigned int cmd, struct flock64 __user *user) -{ - return -EACCES; -} -#endif -static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg) -{ - return -EINVAL; -} - -static inline int fcntl_getlease(struct file *filp) -{ - return F_UNLCK; -} - -static inline void -locks_free_lock_context(struct file_lock_context *ctx) -{ -} - -static inline void locks_init_lock(struct file_lock *fl) -{ - return; -} - -static inline void locks_copy_conflock(struct file_lock *new, struct file_lock *fl) -{ - return; -} - -static inline void locks_copy_lock(struct file_lock *new, struct file_lock *fl) -{ - return; -} - -static inline void locks_remove_posix(struct file *filp, fl_owner_t owner) -{ - return; -} - -static inline void locks_remove_file(struct file *filp) -{ - return; -} - -static inline void posix_test_lock(struct file *filp, struct file_lock *fl) -{ - return; -} - -static inline int posix_lock_file(struct file *filp, struct file_lock *fl, - struct file_lock *conflock) -{ - return -ENOLCK; -} - -static inline int posix_lock_file_wait(struct file *filp, struct file_lock *fl) -{ - return -ENOLCK; -} - -static inline int posix_unblock_lock(struct file_lock *waiter) -{ - return -ENOENT; -} - -static inline int vfs_test_lock(struct file *filp, struct file_lock *fl) -{ - return 0; -} - -static inline int vfs_lock_file(struct file *filp, unsigned int cmd, - struct file_lock *fl, struct file_lock *conf) -{ - return -ENOLCK; -} - -static inline int vfs_cancel_lock(struct file *filp, struct file_lock *fl) -{ - return 0; -} - -static inline int flock_lock_file_wait(struct file *filp, - struct file_lock *request) -{ - return -ENOLCK; -} - -static inline int __break_lease(struct inode *inode, unsigned int mode, unsigned int type) -{ - return 0; -} - -static inline void lease_get_mtime(struct inode *inode, struct timespec *time) -{ - return; -} - -static inline int generic_setlease(struct file *filp, long arg, - struct file_lock **flp, void **priv) -{ - return -EINVAL; -} - -static inline int vfs_setlease(struct file *filp, long arg, - struct file_lock **lease, void **priv) -{ - return -EINVAL; -} - -static inline int lease_modify(struct file_lock *fl, int arg, - struct list_head *dispose) -{ - return -EINVAL; -} -#endif /* !CONFIG_FILE_LOCKING */ - - -struct fasync_struct { - spinlock_t fa_lock; - int magic; - int fa_fd; - struct fasync_struct *fa_next; /* singly linked list */ - struct file *fa_file; - struct rcu_head fa_rcu; -}; - -#define FASYNC_MAGIC 0x4601 - -/* SMP safe fasync helpers: */ -extern int fasync_helper(int, struct file *, int, struct fasync_struct **); -extern struct fasync_struct *fasync_insert_entry(int, struct file *, struct fasync_struct **, struct fasync_struct *); -extern int fasync_remove_entry(struct file *, struct fasync_struct **); -extern struct fasync_struct *fasync_alloc(void); -extern void fasync_free(struct fasync_struct *); - -/* can be called from interrupts */ -extern void kill_fasync(struct fasync_struct **, int, int); - -extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force); -extern void f_setown(struct file *filp, unsigned long arg, int force); -extern void f_delown(struct file *filp); -extern pid_t f_getown(struct file *filp); -extern int send_sigurg(struct fown_struct *fown); - -struct mm_struct; - -/* - * Umount options - */ - -#define MNT_FORCE 0x00000001 /* Attempt to forcibily umount */ -#define MNT_DETACH 0x00000002 /* Just detach from the tree */ -#define MNT_EXPIRE 0x00000004 /* Mark for expiry */ -#define UMOUNT_NOFOLLOW 0x00000008 /* Don't follow symlink on umount */ -#define UMOUNT_UNUSED 0x80000000 /* Flag guaranteed to be unused */ - - -/* Possible states of 'frozen' field */ -enum { - SB_UNFROZEN = 0, /* FS is unfrozen */ - SB_FREEZE_WRITE = 1, /* Writes, dir ops, ioctls frozen */ - SB_FREEZE_PAGEFAULT = 2, /* Page faults stopped as well */ - SB_FREEZE_FS = 3, /* For internal FS use (e.g. to stop - * internal threads if needed) */ - SB_FREEZE_COMPLETE = 4, /* ->freeze_fs finished successfully */ -}; - -#define SB_FREEZE_LEVELS (SB_FREEZE_COMPLETE - 1) - -struct sb_writers { - /* Counters for counting writers at each level */ - struct percpu_counter counter[SB_FREEZE_LEVELS]; - wait_queue_head_t wait; /* queue for waiting for - writers / faults to finish */ - int frozen; /* Is sb frozen? */ - wait_queue_head_t wait_unfrozen; /* queue for waiting for - sb to be thawed */ -#ifdef CONFIG_DEBUG_LOCK_ALLOC - struct lockdep_map lock_map[SB_FREEZE_LEVELS]; -#endif -}; - -struct super_block { - struct list_head s_list; /* Keep this first */ - dev_t s_dev; /* search index; _not_ kdev_t */ - unsigned char s_blocksize_bits; - unsigned long s_blocksize; - loff_t s_maxbytes; /* Max file size */ - struct file_system_type *s_type; - const struct super_operations *s_op; - const struct dquot_operations *dq_op; - const struct quotactl_ops *s_qcop; - const struct export_operations *s_export_op; - unsigned long s_flags; - unsigned long s_magic; - struct dentry *s_root; - struct rw_semaphore s_umount; - int s_count; - atomic_t s_active; -#ifdef CONFIG_SECURITY - void *s_security; -#endif - const struct xattr_handler **s_xattr; - - struct list_head s_inodes; /* all inodes */ - struct hlist_bl_head s_anon; /* anonymous dentries for (nfs) exporting */ - struct list_head s_mounts; /* list of mounts; _not_ for fs use */ - struct block_device *s_bdev; - struct backing_dev_info *s_bdi; - struct mtd_info *s_mtd; - struct hlist_node s_instances; - unsigned int s_quota_types; /* Bitmask of supported quota types */ - struct quota_info s_dquot; /* Diskquota specific options */ - - struct sb_writers s_writers; - - char s_id[32]; /* Informational name */ - u8 s_uuid[16]; /* UUID */ - - void *s_fs_info; /* Filesystem private info */ - unsigned int s_max_links; - fmode_t s_mode; - - /* Granularity of c/m/atime in ns. - Cannot be worse than a second */ - u32 s_time_gran; - - /* - * The next field is for VFS *only*. No filesystems have any business - * even looking at it. You had been warned. - */ - struct mutex s_vfs_rename_mutex; /* Kludge */ - - /* - * Filesystem subtype. If non-empty the filesystem type field - * in /proc/mounts will be "type.subtype" - */ - char *s_subtype; - - /* - * Saved mount options for lazy filesystems using - * generic_show_options() - */ - char __rcu *s_options; - const struct dentry_operations *s_d_op; /* default d_op for dentries */ - - /* - * Saved pool identifier for cleancache (-1 means none) - */ - int cleancache_poolid; - - struct shrinker s_shrink; /* per-sb shrinker handle */ - - /* Number of inodes with nlink == 0 but still referenced */ - atomic_long_t s_remove_count; - - /* Being remounted read-only */ - int s_readonly_remount; - - /* AIO completions deferred from interrupt context */ - struct workqueue_struct *s_dio_done_wq; - struct hlist_head s_pins; - - /* - * Keep the lru lists last in the structure so they always sit on their - * own individual cachelines. - */ - struct list_lru s_dentry_lru ____cacheline_aligned_in_smp; - struct list_lru s_inode_lru ____cacheline_aligned_in_smp; - struct rcu_head rcu; - - /* - * Indicates how deep in a filesystem stack this SB is - */ - int s_stack_depth; -}; - -extern struct timespec current_fs_time(struct super_block *sb); - -/* - * Snapshotting support. - */ - -void __sb_end_write(struct super_block *sb, int level); -int __sb_start_write(struct super_block *sb, int level, bool wait); - -/** - * sb_end_write - drop write access to a superblock - * @sb: the super we wrote to - * - * Decrement number of writers to the filesystem. Wake up possible waiters - * wanting to freeze the filesystem. - */ -static inline void sb_end_write(struct super_block *sb) -{ - __sb_end_write(sb, SB_FREEZE_WRITE); -} - -/** - * sb_end_pagefault - drop write access to a superblock from a page fault - * @sb: the super we wrote to - * - * Decrement number of processes handling write page fault to the filesystem. - * Wake up possible waiters wanting to freeze the filesystem. - */ -static inline void sb_end_pagefault(struct super_block *sb) -{ - __sb_end_write(sb, SB_FREEZE_PAGEFAULT); -} - -/** - * sb_end_intwrite - drop write access to a superblock for internal fs purposes - * @sb: the super we wrote to - * - * Decrement fs-internal number of writers to the filesystem. Wake up possible - * waiters wanting to freeze the filesystem. - */ -static inline void sb_end_intwrite(struct super_block *sb) -{ - __sb_end_write(sb, SB_FREEZE_FS); -} - -/** - * sb_start_write - get write access to a superblock - * @sb: the super we write to - * - * When a process wants to write data or metadata to a file system (i.e. dirty - * a page or an inode), it should embed the operation in a sb_start_write() - - * sb_end_write() pair to get exclusion against file system freezing. This - * function increments number of writers preventing freezing. If the file - * system is already frozen, the function waits until the file system is - * thawed. - * - * Since freeze protection behaves as a lock, users have to preserve - * ordering of freeze protection and other filesystem locks. Generally, - * freeze protection should be the outermost lock. In particular, we have: - * - * sb_start_write - * -> i_mutex (write path, truncate, directory ops, ...) - * -> s_umount (freeze_super, thaw_super) - */ -static inline void sb_start_write(struct super_block *sb) -{ - __sb_start_write(sb, SB_FREEZE_WRITE, true); -} - -static inline int sb_start_write_trylock(struct super_block *sb) -{ - return __sb_start_write(sb, SB_FREEZE_WRITE, false); -} - -/** - * sb_start_pagefault - get write access to a superblock from a page fault - * @sb: the super we write to - * - * When a process starts handling write page fault, it should embed the - * operation into sb_start_pagefault() - sb_end_pagefault() pair to get - * exclusion against file system freezing. This is needed since the page fault - * is going to dirty a page. This function increments number of running page - * faults preventing freezing. If the file system is already frozen, the - * function waits until the file system is thawed. - * - * Since page fault freeze protection behaves as a lock, users have to preserve - * ordering of freeze protection and other filesystem locks. It is advised to - * put sb_start_pagefault() close to mmap_sem in lock ordering. Page fault - * handling code implies lock dependency: - * - * mmap_sem - * -> sb_start_pagefault - */ -static inline void sb_start_pagefault(struct super_block *sb) -{ - __sb_start_write(sb, SB_FREEZE_PAGEFAULT, true); -} - -/* - * sb_start_intwrite - get write access to a superblock for internal fs purposes - * @sb: the super we write to - * - * This is the third level of protection against filesystem freezing. It is - * free for use by a filesystem. The only requirement is that it must rank - * below sb_start_pagefault. - * - * For example filesystem can call sb_start_intwrite() when starting a - * transaction which somewhat eases handling of freezing for internal sources - * of filesystem changes (internal fs threads, discarding preallocation on file - * close, etc.). - */ -static inline void sb_start_intwrite(struct super_block *sb) -{ - __sb_start_write(sb, SB_FREEZE_FS, true); -} - - -extern bool inode_owner_or_capable(const struct inode *inode); - -/* - * VFS helper functions.. - */ -extern int vfs_create(struct inode *, struct dentry *, umode_t, bool); -extern int vfs_mkdir(struct inode *, struct dentry *, umode_t); -extern int vfs_mknod(struct inode *, struct dentry *, umode_t, dev_t); -extern int vfs_symlink(struct inode *, struct dentry *, const char *); -extern int vfs_link(struct dentry *, struct inode *, struct dentry *, struct inode **); -extern int vfs_rmdir(struct inode *, struct dentry *); -extern int vfs_unlink(struct inode *, struct dentry *, struct inode **); -extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *, struct inode **, unsigned int); -extern int vfs_whiteout(struct inode *, struct dentry *); - -/* - * VFS dentry helper functions. - */ -extern void dentry_unhash(struct dentry *dentry); - -/* - * VFS file helper functions. - */ -extern void inode_init_owner(struct inode *inode, const struct inode *dir, - umode_t mode); -/* - * VFS FS_IOC_FIEMAP helper definitions. - */ -struct fiemap_extent_info { - unsigned int fi_flags; /* Flags as passed from user */ - unsigned int fi_extents_mapped; /* Number of mapped extents */ - unsigned int fi_extents_max; /* Size of fiemap_extent array */ - struct fiemap_extent __user *fi_extents_start; /* Start of - fiemap_extent array */ -}; -int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical, - u64 phys, u64 len, u32 flags); -int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags); - -/* - * File types - * - * NOTE! These match bits 12..15 of stat.st_mode - * (ie "(i_mode >> 12) & 15"). - */ -#define DT_UNKNOWN 0 -#define DT_FIFO 1 -#define DT_CHR 2 -#define DT_DIR 4 -#define DT_BLK 6 -#define DT_REG 8 -#define DT_LNK 10 -#define DT_SOCK 12 -#define DT_WHT 14 - -/* - * This is the "filldir" function type, used by readdir() to let - * the kernel specify what kind of dirent layout it wants to have. - * This allows the kernel to read directories into kernel space or - * to have different dirent layouts depending on the binary type. - */ -struct dir_context; -typedef int (*filldir_t)(struct dir_context *, const char *, int, loff_t, u64, - unsigned); - -struct dir_context { - const filldir_t actor; - loff_t pos; -}; - -struct block_device_operations; - -/* These macros are for out of kernel modules to test that - * the kernel supports the unlocked_ioctl and compat_ioctl - * fields in struct file_operations. */ -#define HAVE_COMPAT_IOCTL 1 -#define HAVE_UNLOCKED_IOCTL 1 - -/* - * These flags let !MMU mmap() govern direct device mapping vs immediate - * copying more easily for MAP_PRIVATE, especially for ROM filesystems. - * - * NOMMU_MAP_COPY: Copy can be mapped (MAP_PRIVATE) - * NOMMU_MAP_DIRECT: Can be mapped directly (MAP_SHARED) - * NOMMU_MAP_READ: Can be mapped for reading - * NOMMU_MAP_WRITE: Can be mapped for writing - * NOMMU_MAP_EXEC: Can be mapped for execution - */ -#define NOMMU_MAP_COPY 0x00000001 -#define NOMMU_MAP_DIRECT 0x00000008 -#define NOMMU_MAP_READ VM_MAYREAD -#define NOMMU_MAP_WRITE VM_MAYWRITE -#define NOMMU_MAP_EXEC VM_MAYEXEC - -#define NOMMU_VMFLAGS \ - (NOMMU_MAP_READ | NOMMU_MAP_WRITE | NOMMU_MAP_EXEC) - - -struct iov_iter; - -struct file_operations { - struct module *owner; - loff_t (*llseek) (struct file *, loff_t, int); - ssize_t (*read) (struct file *, char __user *, size_t, loff_t *); - ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); - ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); - ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); - ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); - ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); - int (*iterate) (struct file *, struct dir_context *); - unsigned int (*poll) (struct file *, struct poll_table_struct *); - long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); - long (*compat_ioctl) (struct file *, unsigned int, unsigned long); - int (*mmap) (struct file *, struct vm_area_struct *); - int (*mremap)(struct file *, struct vm_area_struct *); - int (*open) (struct inode *, struct file *); - int (*flush) (struct file *, fl_owner_t id); - int (*release) (struct inode *, struct file *); - int (*fsync) (struct file *, loff_t, loff_t, int datasync); - int (*aio_fsync) (struct kiocb *, int datasync); - int (*fasync) (int, struct file *, int); - int (*lock) (struct file *, int, struct file_lock *); - ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); - unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); - int (*check_flags)(int); - int (*flock) (struct file *, int, struct file_lock *); - ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); - ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); - int (*setlease)(struct file *, long, struct file_lock **, void **); - long (*fallocate)(struct file *file, int mode, loff_t offset, - loff_t len); - void (*show_fdinfo)(struct seq_file *m, struct file *f); -#ifndef CONFIG_MMU - unsigned (*mmap_capabilities)(struct file *); -#endif -}; - -struct inode_operations { - struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int); - void * (*follow_link) (struct dentry *, struct nameidata *); - int (*permission) (struct inode *, int); - struct posix_acl * (*get_acl)(struct inode *, int); - - int (*readlink) (struct dentry *, char __user *,int); - void (*put_link) (struct dentry *, struct nameidata *, void *); - - int (*create) (struct inode *,struct dentry *, umode_t, bool); - int (*link) (struct dentry *,struct inode *,struct dentry *); - int (*unlink) (struct inode *,struct dentry *); - int (*symlink) (struct inode *,struct dentry *,const char *); - int (*mkdir) (struct inode *,struct dentry *,umode_t); - int (*rmdir) (struct inode *,struct dentry *); - int (*mknod) (struct inode *,struct dentry *,umode_t,dev_t); - int (*rename) (struct inode *, struct dentry *, - struct inode *, struct dentry *); - int (*rename2) (struct inode *, struct dentry *, - struct inode *, struct dentry *, unsigned int); - int (*setattr) (struct dentry *, struct iattr *); - int (*getattr) (struct vfsmount *mnt, struct dentry *, struct kstat *); - int (*setxattr) (struct dentry *, const char *,const void *,size_t,int); - ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t); - ssize_t (*listxattr) (struct dentry *, char *, size_t); - int (*removexattr) (struct dentry *, const char *); - int (*fiemap)(struct inode *, struct fiemap_extent_info *, u64 start, - u64 len); - int (*update_time)(struct inode *, struct timespec *, int); - int (*atomic_open)(struct inode *, struct dentry *, - struct file *, unsigned open_flag, - umode_t create_mode, int *opened); - int (*tmpfile) (struct inode *, struct dentry *, umode_t); - int (*set_acl)(struct inode *, struct posix_acl *, int); - - /* WARNING: probably going away soon, do not use! */ - int (*dentry_open)(struct dentry *, struct file *, const struct cred *); -} ____cacheline_aligned; - -ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, - unsigned long nr_segs, unsigned long fast_segs, - struct iovec *fast_pointer, - struct iovec **ret_pointer); - -extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *); -extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); -extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); -extern ssize_t vfs_readv(struct file *, const struct iovec __user *, - unsigned long, loff_t *); -extern ssize_t vfs_writev(struct file *, const struct iovec __user *, - unsigned long, loff_t *); - -struct super_operations { - struct inode *(*alloc_inode)(struct super_block *sb); - void (*destroy_inode)(struct inode *); - - void (*dirty_inode) (struct inode *, int flags); - int (*write_inode) (struct inode *, struct writeback_control *wbc); - int (*drop_inode) (struct inode *); - void (*evict_inode) (struct inode *); - void (*put_super) (struct super_block *); - int (*sync_fs)(struct super_block *sb, int wait); - int (*freeze_super) (struct super_block *); - int (*freeze_fs) (struct super_block *); - int (*thaw_super) (struct super_block *); - int (*unfreeze_fs) (struct super_block *); - int (*statfs) (struct dentry *, struct kstatfs *); - int (*remount_fs) (struct super_block *, int *, char *); - void (*umount_begin) (struct super_block *); - - int (*show_options)(struct seq_file *, struct dentry *); - int (*show_devname)(struct seq_file *, struct dentry *); - int (*show_path)(struct seq_file *, struct dentry *); - int (*show_stats)(struct seq_file *, struct dentry *); -#ifdef CONFIG_QUOTA - ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t); - ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t); - struct dquot **(*get_dquots)(struct inode *); -#endif - int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t); - long (*nr_cached_objects)(struct super_block *, - struct shrink_control *); - long (*free_cached_objects)(struct super_block *, - struct shrink_control *); -}; - -/* - * Inode flags - they have no relation to superblock flags now - */ -#define S_SYNC 1 /* Writes are synced at once */ -#define S_NOATIME 2 /* Do not update access times */ -#define S_APPEND 4 /* Append-only file */ -#define S_IMMUTABLE 8 /* Immutable file */ -#define S_DEAD 16 /* removed, but still open directory */ -#define S_NOQUOTA 32 /* Inode is not counted to quota */ -#define S_DIRSYNC 64 /* Directory modifications are synchronous */ -#define S_NOCMTIME 128 /* Do not update file c/mtime */ -#define S_SWAPFILE 256 /* Do not truncate: swapon got its bmaps */ -#define S_PRIVATE 512 /* Inode is fs-internal */ -#define S_IMA 1024 /* Inode has an associated IMA struct */ -#define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */ -#define S_NOSEC 4096 /* no suid or xattr security attributes */ -#ifdef CONFIG_FS_DAX -#define S_DAX 8192 /* Direct Access, avoiding the page cache */ -#else -#define S_DAX 0 /* Make all the DAX code disappear */ -#endif - -/* - * Note that nosuid etc flags are inode-specific: setting some file-system - * flags just means all the inodes inherit those flags by default. It might be - * possible to override it selectively if you really wanted to with some - * ioctl() that is not currently implemented. - * - * Exception: MS_RDONLY is always applied to the entire file system. - * - * Unfortunately, it is possible to change a filesystems flags with it mounted - * with files in use. This means that all of the inodes will not have their - * i_flags updated. Hence, i_flags no longer inherit the superblock mount - * flags, so these have to be checked separately. -- rmk@arm.uk.linux.org - */ -#define __IS_FLG(inode, flg) ((inode)->i_sb->s_flags & (flg)) - -#define IS_RDONLY(inode) ((inode)->i_sb->s_flags & MS_RDONLY) -#define IS_SYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS) || \ - ((inode)->i_flags & S_SYNC)) -#define IS_DIRSYNC(inode) (__IS_FLG(inode, MS_SYNCHRONOUS|MS_DIRSYNC) || \ - ((inode)->i_flags & (S_SYNC|S_DIRSYNC))) -#define IS_MANDLOCK(inode) __IS_FLG(inode, MS_MANDLOCK) -#define IS_NOATIME(inode) __IS_FLG(inode, MS_RDONLY|MS_NOATIME) -#define IS_I_VERSION(inode) __IS_FLG(inode, MS_I_VERSION) - -#define IS_NOQUOTA(inode) ((inode)->i_flags & S_NOQUOTA) -#define IS_APPEND(inode) ((inode)->i_flags & S_APPEND) -#define IS_IMMUTABLE(inode) ((inode)->i_flags & S_IMMUTABLE) -#define IS_POSIXACL(inode) __IS_FLG(inode, MS_POSIXACL) - -#define IS_DEADDIR(inode) ((inode)->i_flags & S_DEAD) -#define IS_NOCMTIME(inode) ((inode)->i_flags & S_NOCMTIME) -#define IS_SWAPFILE(inode) ((inode)->i_flags & S_SWAPFILE) -#define IS_PRIVATE(inode) ((inode)->i_flags & S_PRIVATE) -#define IS_IMA(inode) ((inode)->i_flags & S_IMA) -#define IS_AUTOMOUNT(inode) ((inode)->i_flags & S_AUTOMOUNT) -#define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC) -#define IS_DAX(inode) ((inode)->i_flags & S_DAX) - -#define IS_WHITEOUT(inode) (S_ISCHR(inode->i_mode) && \ - (inode)->i_rdev == WHITEOUT_DEV) - -/* - * Inode state bits. Protected by inode->i_lock - * - * Three bits determine the dirty state of the inode, I_DIRTY_SYNC, - * I_DIRTY_DATASYNC and I_DIRTY_PAGES. - * - * Four bits define the lifetime of an inode. Initially, inodes are I_NEW, - * until that flag is cleared. I_WILL_FREE, I_FREEING and I_CLEAR are set at - * various stages of removing an inode. - * - * Two bits are used for locking and completion notification, I_NEW and I_SYNC. - * - * I_DIRTY_SYNC Inode is dirty, but doesn't have to be written on - * fdatasync(). i_atime is the usual cause. - * I_DIRTY_DATASYNC Data-related inode changes pending. We keep track of - * these changes separately from I_DIRTY_SYNC so that we - * don't have to write inode on fdatasync() when only - * mtime has changed in it. - * I_DIRTY_PAGES Inode has dirty pages. Inode itself may be clean. - * I_NEW Serves as both a mutex and completion notification. - * New inodes set I_NEW. If two processes both create - * the same inode, one of them will release its inode and - * wait for I_NEW to be released before returning. - * Inodes in I_WILL_FREE, I_FREEING or I_CLEAR state can - * also cause waiting on I_NEW, without I_NEW actually - * being set. find_inode() uses this to prevent returning - * nearly-dead inodes. - * I_WILL_FREE Must be set when calling write_inode_now() if i_count - * is zero. I_FREEING must be set when I_WILL_FREE is - * cleared. - * I_FREEING Set when inode is about to be freed but still has dirty - * pages or buffers attached or the inode itself is still - * dirty. - * I_CLEAR Added by clear_inode(). In this state the inode is - * clean and can be destroyed. Inode keeps I_FREEING. - * - * Inodes that are I_WILL_FREE, I_FREEING or I_CLEAR are - * prohibited for many purposes. iget() must wait for - * the inode to be completely released, then create it - * anew. Other functions will just ignore such inodes, - * if appropriate. I_NEW is used for waiting. - * - * I_SYNC Writeback of inode is running. The bit is set during - * data writeback, and cleared with a wakeup on the bit - * address once it is done. The bit is also used to pin - * the inode in memory for flusher thread. - * - * I_REFERENCED Marks the inode as recently references on the LRU list. - * - * I_DIO_WAKEUP Never set. Only used as a key for wait_on_bit(). - * - * Q: What is the difference between I_WILL_FREE and I_FREEING? - */ -#define I_DIRTY_SYNC (1 << 0) -#define I_DIRTY_DATASYNC (1 << 1) -#define I_DIRTY_PAGES (1 << 2) -#define __I_NEW 3 -#define I_NEW (1 << __I_NEW) -#define I_WILL_FREE (1 << 4) -#define I_FREEING (1 << 5) -#define I_CLEAR (1 << 6) -#define __I_SYNC 7 -#define I_SYNC (1 << __I_SYNC) -#define I_REFERENCED (1 << 8) -#define __I_DIO_WAKEUP 9 -#define I_DIO_WAKEUP (1 << I_DIO_WAKEUP) -#define I_LINKABLE (1 << 10) -#define I_DIRTY_TIME (1 << 11) -#define __I_DIRTY_TIME_EXPIRED 12 -#define I_DIRTY_TIME_EXPIRED (1 << __I_DIRTY_TIME_EXPIRED) - -#define I_DIRTY (I_DIRTY_SYNC | I_DIRTY_DATASYNC | I_DIRTY_PAGES) -#define I_DIRTY_ALL (I_DIRTY | I_DIRTY_TIME) - -extern void __mark_inode_dirty(struct inode *, int); -static inline void mark_inode_dirty(struct inode *inode) -{ - __mark_inode_dirty(inode, I_DIRTY); -} - -static inline void mark_inode_dirty_sync(struct inode *inode) -{ - __mark_inode_dirty(inode, I_DIRTY_SYNC); -} - -extern void inc_nlink(struct inode *inode); -extern void drop_nlink(struct inode *inode); -extern void clear_nlink(struct inode *inode); -extern void set_nlink(struct inode *inode, unsigned int nlink); - -static inline void inode_inc_link_count(struct inode *inode) -{ - inc_nlink(inode); - mark_inode_dirty(inode); -} - -static inline void inode_dec_link_count(struct inode *inode) -{ - drop_nlink(inode); - mark_inode_dirty(inode); -} - -/** - * inode_inc_iversion - increments i_version - * @inode: inode that need to be updated - * - * Every time the inode is modified, the i_version field will be incremented. - * The filesystem has to be mounted with i_version flag - */ - -static inline void inode_inc_iversion(struct inode *inode) -{ - spin_lock(&inode->i_lock); - inode->i_version++; - spin_unlock(&inode->i_lock); -} - -enum file_time_flags { - S_ATIME = 1, - S_MTIME = 2, - S_CTIME = 4, - S_VERSION = 8, -}; - -extern void touch_atime(const struct path *); -static inline void file_accessed(struct file *file) -{ - if (!(file->f_flags & O_NOATIME)) - touch_atime(&file->f_path); -} - -int sync_inode(struct inode *inode, struct writeback_control *wbc); -int sync_inode_metadata(struct inode *inode, int wait); - -struct file_system_type { - const char *name; - int fs_flags; -#define FS_REQUIRES_DEV 1 -#define FS_BINARY_MOUNTDATA 2 -#define FS_HAS_SUBTYPE 4 -#define FS_USERNS_MOUNT 8 /* Can be mounted by userns root */ -#define FS_USERNS_DEV_MOUNT 16 /* A userns mount does not imply MNT_NODEV */ -#define FS_RENAME_DOES_D_MOVE 32768 /* FS will handle d_move() during rename() internally. */ - struct dentry *(*mount) (struct file_system_type *, int, - const char *, void *); - void (*kill_sb) (struct super_block *); - struct module *owner; - struct file_system_type * next; - struct hlist_head fs_supers; - - struct lock_class_key s_lock_key; - struct lock_class_key s_umount_key; - struct lock_class_key s_vfs_rename_key; - struct lock_class_key s_writers_key[SB_FREEZE_LEVELS]; - - struct lock_class_key i_lock_key; - struct lock_class_key i_mutex_key; - struct lock_class_key i_mutex_dir_key; -}; - -#define MODULE_ALIAS_FS(NAME) MODULE_ALIAS("fs-" NAME) - -extern struct dentry *mount_ns(struct file_system_type *fs_type, int flags, - void *data, int (*fill_super)(struct super_block *, void *, int)); -extern struct dentry *mount_bdev(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data, - int (*fill_super)(struct super_block *, void *, int)); -extern struct dentry *mount_single(struct file_system_type *fs_type, - int flags, void *data, - int (*fill_super)(struct super_block *, void *, int)); -extern struct dentry *mount_nodev(struct file_system_type *fs_type, - int flags, void *data, - int (*fill_super)(struct super_block *, void *, int)); -extern struct dentry *mount_subtree(struct vfsmount *mnt, const char *path); -void generic_shutdown_super(struct super_block *sb); -void kill_block_super(struct super_block *sb); -void kill_anon_super(struct super_block *sb); -void kill_litter_super(struct super_block *sb); -void deactivate_super(struct super_block *sb); -void deactivate_locked_super(struct super_block *sb); -int set_anon_super(struct super_block *s, void *data); -int get_anon_bdev(dev_t *); -void free_anon_bdev(dev_t); -struct super_block *sget(struct file_system_type *type, - int (*test)(struct super_block *,void *), - int (*set)(struct super_block *,void *), - int flags, void *data); -extern struct dentry *mount_pseudo(struct file_system_type *, char *, - const struct super_operations *ops, - const struct dentry_operations *dops, - unsigned long); - -/* Alas, no aliases. Too much hassle with bringing module.h everywhere */ -#define fops_get(fops) \ - (((fops) && try_module_get((fops)->owner) ? (fops) : NULL)) -#define fops_put(fops) \ - do { if (fops) module_put((fops)->owner); } while(0) -/* - * This one is to be used *ONLY* from ->open() instances. - * fops must be non-NULL, pinned down *and* module dependencies - * should be sufficient to pin the caller down as well. - */ -#define replace_fops(f, fops) \ - do { \ - struct file *__file = (f); \ - fops_put(__file->f_op); \ - BUG_ON(!(__file->f_op = (fops))); \ - } while(0) - -extern int register_filesystem(struct file_system_type *); -extern int unregister_filesystem(struct file_system_type *); -extern struct vfsmount *kern_mount_data(struct file_system_type *, void *data); -#define kern_mount(type) kern_mount_data(type, NULL) -extern void kern_unmount(struct vfsmount *mnt); -extern int may_umount_tree(struct vfsmount *); -extern int may_umount(struct vfsmount *); -extern long do_mount(const char *, const char __user *, - const char *, unsigned long, void *); -extern struct vfsmount *collect_mounts(struct path *); -extern void drop_collected_mounts(struct vfsmount *); -extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, - struct vfsmount *); -extern int vfs_statfs(struct path *, struct kstatfs *); -extern int user_statfs(const char __user *, struct kstatfs *); -extern int fd_statfs(int, struct kstatfs *); -extern int vfs_ustat(dev_t, struct kstatfs *); -extern int freeze_super(struct super_block *super); -extern int thaw_super(struct super_block *super); -extern bool our_mnt(struct vfsmount *mnt); -extern bool fs_fully_visible(struct file_system_type *); - -extern int current_umask(void); - -extern void ihold(struct inode * inode); -extern void iput(struct inode *); -extern int generic_update_time(struct inode *, struct timespec *, int); - -static inline struct inode *file_inode(const struct file *f) -{ - return f->f_inode; -} - -/* /sys/fs */ -extern struct kobject *fs_kobj; - -#define MAX_RW_COUNT (INT_MAX & PAGE_CACHE_MASK) - -#define FLOCK_VERIFY_READ 1 -#define FLOCK_VERIFY_WRITE 2 - -#ifdef CONFIG_FILE_LOCKING -extern int locks_mandatory_locked(struct file *); -extern int locks_mandatory_area(int, struct inode *, struct file *, loff_t, size_t); - -/* - * Candidates for mandatory locking have the setgid bit set - * but no group execute bit - an otherwise meaningless combination. - */ - -static inline int __mandatory_lock(struct inode *ino) -{ - return (ino->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID; -} - -/* - * ... and these candidates should be on MS_MANDLOCK mounted fs, - * otherwise these will be advisory locks - */ - -static inline int mandatory_lock(struct inode *ino) -{ - return IS_MANDLOCK(ino) && __mandatory_lock(ino); -} - -static inline int locks_verify_locked(struct file *file) -{ - if (mandatory_lock(file_inode(file))) - return locks_mandatory_locked(file); - return 0; -} - -static inline int locks_verify_truncate(struct inode *inode, - struct file *filp, - loff_t size) -{ - if (inode->i_flctx && mandatory_lock(inode)) - return locks_mandatory_area( - FLOCK_VERIFY_WRITE, inode, filp, - size < inode->i_size ? size : inode->i_size, - (size < inode->i_size ? inode->i_size - size - : size - inode->i_size) - ); - return 0; -} - -static inline int break_lease(struct inode *inode, unsigned int mode) -{ - /* - * Since this check is lockless, we must ensure that any refcounts - * taken are done before checking i_flctx->flc_lease. Otherwise, we - * could end up racing with tasks trying to set a new lease on this - * file. - */ - smp_mb(); - if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) - return __break_lease(inode, mode, FL_LEASE); - return 0; -} - -static inline int break_deleg(struct inode *inode, unsigned int mode) -{ - /* - * Since this check is lockless, we must ensure that any refcounts - * taken are done before checking i_flctx->flc_lease. Otherwise, we - * could end up racing with tasks trying to set a new lease on this - * file. - */ - smp_mb(); - if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) - return __break_lease(inode, mode, FL_DELEG); - return 0; -} - -static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) -{ - int ret; - - ret = break_deleg(inode, O_WRONLY|O_NONBLOCK); - if (ret == -EWOULDBLOCK && delegated_inode) { - *delegated_inode = inode; - ihold(inode); - } - return ret; -} - -static inline int break_deleg_wait(struct inode **delegated_inode) -{ - int ret; - - ret = break_deleg(*delegated_inode, O_WRONLY); - iput(*delegated_inode); - *delegated_inode = NULL; - return ret; -} - -static inline int break_layout(struct inode *inode, bool wait) -{ - smp_mb(); - if (inode->i_flctx && !list_empty_careful(&inode->i_flctx->flc_lease)) - return __break_lease(inode, - wait ? O_WRONLY : O_WRONLY | O_NONBLOCK, - FL_LAYOUT); - return 0; -} - -#else /* !CONFIG_FILE_LOCKING */ -static inline int locks_mandatory_locked(struct file *file) -{ - return 0; -} - -static inline int locks_mandatory_area(int rw, struct inode *inode, - struct file *filp, loff_t offset, - size_t count) -{ - return 0; -} - -static inline int __mandatory_lock(struct inode *inode) -{ - return 0; -} - -static inline int mandatory_lock(struct inode *inode) -{ - return 0; -} - -static inline int locks_verify_locked(struct file *file) -{ - return 0; -} - -static inline int locks_verify_truncate(struct inode *inode, struct file *filp, - size_t size) -{ - return 0; -} - -static inline int break_lease(struct inode *inode, unsigned int mode) -{ - return 0; -} - -static inline int break_deleg(struct inode *inode, unsigned int mode) -{ - return 0; -} - -static inline int try_break_deleg(struct inode *inode, struct inode **delegated_inode) -{ - return 0; -} - -static inline int break_deleg_wait(struct inode **delegated_inode) -{ - BUG(); - return 0; -} - -static inline int break_layout(struct inode *inode, bool wait) -{ - return 0; -} - -#endif /* CONFIG_FILE_LOCKING */ - -/* fs/open.c */ -struct audit_names; -struct filename { - const char *name; /* pointer to actual string */ - const __user char *uptr; /* original userland pointer */ - struct audit_names *aname; - int refcnt; - bool separate; /* should "name" be freed? */ -}; - -extern long vfs_truncate(struct path *, loff_t); -extern int do_truncate(struct dentry *, loff_t start, unsigned int time_attrs, - struct file *filp); -extern int vfs_fallocate(struct file *file, int mode, loff_t offset, - loff_t len); -extern long do_sys_open(int dfd, const char __user *filename, int flags, - umode_t mode); -extern struct file *file_open_name(struct filename *, int, umode_t); -extern struct file *filp_open(const char *, int, umode_t); -extern struct file *file_open_root(struct dentry *, struct vfsmount *, - const char *, int); -extern int vfs_open(const struct path *, struct file *, const struct cred *); -extern struct file * dentry_open(const struct path *, int, const struct cred *); -extern int filp_close(struct file *, fl_owner_t id); - -extern struct filename *getname_flags(const char __user *, int, int *); -extern struct filename *getname(const char __user *); -extern struct filename *getname_kernel(const char *); -extern void putname(struct filename *name); - -enum { - FILE_CREATED = 1, - FILE_OPENED = 2 -}; -extern int finish_open(struct file *file, struct dentry *dentry, - int (*open)(struct inode *, struct file *), - int *opened); -extern int finish_no_open(struct file *file, struct dentry *dentry); - -/* fs/ioctl.c */ - -extern int ioctl_preallocate(struct file *filp, void __user *argp); - -/* fs/dcache.c */ -extern void __init vfs_caches_init_early(void); -extern void __init vfs_caches_init(unsigned long); - -extern struct kmem_cache *names_cachep; - -#define __getname() kmem_cache_alloc(names_cachep, GFP_KERNEL) -#define __putname(name) kmem_cache_free(names_cachep, (void *)(name)) - -#ifdef CONFIG_BLOCK -extern int register_blkdev(unsigned int, const char *); -extern void unregister_blkdev(unsigned int, const char *); -extern struct block_device *bdget(dev_t); -extern struct block_device *bdgrab(struct block_device *bdev); -extern void bd_set_size(struct block_device *, loff_t size); -extern void bd_forget(struct inode *inode); -extern void bdput(struct block_device *); -extern void invalidate_bdev(struct block_device *); -extern void iterate_bdevs(void (*)(struct block_device *, void *), void *); -extern int sync_blockdev(struct block_device *bdev); -extern void kill_bdev(struct block_device *); -extern struct super_block *freeze_bdev(struct block_device *); -extern void emergency_thaw_all(void); -extern int thaw_bdev(struct block_device *bdev, struct super_block *sb); -extern int fsync_bdev(struct block_device *); -extern int sb_is_blkdev_sb(struct super_block *sb); -#else -static inline void bd_forget(struct inode *inode) {} -static inline int sync_blockdev(struct block_device *bdev) { return 0; } -static inline void kill_bdev(struct block_device *bdev) {} -static inline void invalidate_bdev(struct block_device *bdev) {} - -static inline struct super_block *freeze_bdev(struct block_device *sb) -{ - return NULL; -} - -static inline int thaw_bdev(struct block_device *bdev, struct super_block *sb) -{ - return 0; -} - -static inline void iterate_bdevs(void (*f)(struct block_device *, void *), void *arg) -{ -} - -static inline int sb_is_blkdev_sb(struct super_block *sb) -{ - return 0; -} -#endif -extern int sync_filesystem(struct super_block *); -extern const struct file_operations def_blk_fops; -extern const struct file_operations def_chr_fops; -#ifdef CONFIG_BLOCK -extern int ioctl_by_bdev(struct block_device *, unsigned, unsigned long); -extern int blkdev_ioctl(struct block_device *, fmode_t, unsigned, unsigned long); -extern long compat_blkdev_ioctl(struct file *, unsigned, unsigned long); -extern int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); -extern struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, - void *holder); -extern struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, - void *holder); -extern void blkdev_put(struct block_device *bdev, fmode_t mode); -#ifdef CONFIG_SYSFS -extern int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); -extern void bd_unlink_disk_holder(struct block_device *bdev, - struct gendisk *disk); -#else -static inline int bd_link_disk_holder(struct block_device *bdev, - struct gendisk *disk) -{ - return 0; -} -static inline void bd_unlink_disk_holder(struct block_device *bdev, - struct gendisk *disk) -{ -} -#endif -#endif - -/* fs/char_dev.c */ -#define CHRDEV_MAJOR_HASH_SIZE 255 -extern int alloc_chrdev_region(dev_t *, unsigned, unsigned, const char *); -extern int register_chrdev_region(dev_t, unsigned, const char *); -extern int __register_chrdev(unsigned int major, unsigned int baseminor, - unsigned int count, const char *name, - const struct file_operations *fops); -extern void __unregister_chrdev(unsigned int major, unsigned int baseminor, - unsigned int count, const char *name); -extern void unregister_chrdev_region(dev_t, unsigned); -extern void chrdev_show(struct seq_file *,off_t); - -static inline int register_chrdev(unsigned int major, const char *name, - const struct file_operations *fops) -{ - return __register_chrdev(major, 0, 256, name, fops); -} - -static inline void unregister_chrdev(unsigned int major, const char *name) -{ - __unregister_chrdev(major, 0, 256, name); -} - -/* fs/block_dev.c */ -#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ -#define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ - -#ifdef CONFIG_BLOCK -#define BLKDEV_MAJOR_HASH_SIZE 255 -extern const char *__bdevname(dev_t, char *buffer); -extern const char *bdevname(struct block_device *bdev, char *buffer); -extern struct block_device *lookup_bdev(const char *); -extern void blkdev_show(struct seq_file *,off_t); - -#else -#define BLKDEV_MAJOR_HASH_SIZE 0 -#endif - -extern void init_special_inode(struct inode *, umode_t, dev_t); - -/* Invalid inode operations -- fs/bad_inode.c */ -extern void make_bad_inode(struct inode *); -extern int is_bad_inode(struct inode *); - -#ifdef CONFIG_BLOCK -/* - * return READ, READA, or WRITE - */ -#define bio_rw(bio) ((bio)->bi_rw & (RW_MASK | RWA_MASK)) - -/* - * return data direction, READ or WRITE - */ -#define bio_data_dir(bio) ((bio)->bi_rw & 1) - -extern void check_disk_size_change(struct gendisk *disk, - struct block_device *bdev); -extern int revalidate_disk(struct gendisk *); -extern int check_disk_change(struct block_device *); -extern int __invalidate_device(struct block_device *, bool); -extern int invalidate_partition(struct gendisk *, int); -#endif -unsigned long invalidate_mapping_pages(struct address_space *mapping, - pgoff_t start, pgoff_t end); - -static inline void invalidate_remote_inode(struct inode *inode) -{ - if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || - S_ISLNK(inode->i_mode)) - invalidate_mapping_pages(inode->i_mapping, 0, -1); -} -extern int invalidate_inode_pages2(struct address_space *mapping); -extern int invalidate_inode_pages2_range(struct address_space *mapping, - pgoff_t start, pgoff_t end); -extern int write_inode_now(struct inode *, int); -extern int filemap_fdatawrite(struct address_space *); -extern int filemap_flush(struct address_space *); -extern int filemap_fdatawait(struct address_space *); -extern int filemap_fdatawait_range(struct address_space *, loff_t lstart, - loff_t lend); -extern int filemap_write_and_wait(struct address_space *mapping); -extern int filemap_write_and_wait_range(struct address_space *mapping, - loff_t lstart, loff_t lend); -extern int __filemap_fdatawrite_range(struct address_space *mapping, - loff_t start, loff_t end, int sync_mode); -extern int filemap_fdatawrite_range(struct address_space *mapping, - loff_t start, loff_t end); - -extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end, - int datasync); -extern int vfs_fsync(struct file *file, int datasync); -static inline int generic_write_sync(struct file *file, loff_t pos, loff_t count) -{ - if (!(file->f_flags & O_DSYNC) && !IS_SYNC(file->f_mapping->host)) - return 0; - return vfs_fsync_range(file, pos, pos + count - 1, - (file->f_flags & __O_SYNC) ? 0 : 1); -} -extern void emergency_sync(void); -extern void emergency_remount(void); -#ifdef CONFIG_BLOCK -extern sector_t bmap(struct inode *, sector_t); -#endif -extern int notify_change(struct dentry *, struct iattr *, struct inode **); -extern int inode_permission(struct inode *, int); -extern int __inode_permission(struct inode *, int); -extern int generic_permission(struct inode *, int); -extern int __check_sticky(struct inode *dir, struct inode *inode); - -static inline bool execute_ok(struct inode *inode) -{ - return (inode->i_mode & S_IXUGO) || S_ISDIR(inode->i_mode); -} - -static inline void file_start_write(struct file *file) -{ - if (!S_ISREG(file_inode(file)->i_mode)) - return; - __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, true); -} - -static inline bool file_start_write_trylock(struct file *file) -{ - if (!S_ISREG(file_inode(file)->i_mode)) - return true; - return __sb_start_write(file_inode(file)->i_sb, SB_FREEZE_WRITE, false); -} - -static inline void file_end_write(struct file *file) -{ - if (!S_ISREG(file_inode(file)->i_mode)) - return; - __sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE); -} - -/* - * get_write_access() gets write permission for a file. - * put_write_access() releases this write permission. - * This is used for regular files. - * We cannot support write (and maybe mmap read-write shared) accesses and - * MAP_DENYWRITE mmappings simultaneously. The i_writecount field of an inode - * can have the following values: - * 0: no writers, no VM_DENYWRITE mappings - * < 0: (-i_writecount) vm_area_structs with VM_DENYWRITE set exist - * > 0: (i_writecount) users are writing to the file. - * - * Normally we operate on that counter with atomic_{inc,dec} and it's safe - * except for the cases where we don't hold i_writecount yet. Then we need to - * use {get,deny}_write_access() - these functions check the sign and refuse - * to do the change if sign is wrong. - */ -static inline int get_write_access(struct inode *inode) -{ - return atomic_inc_unless_negative(&inode->i_writecount) ? 0 : -ETXTBSY; -} -static inline int deny_write_access(struct file *file) -{ - struct inode *inode = file_inode(file); - return atomic_dec_unless_positive(&inode->i_writecount) ? 0 : -ETXTBSY; -} -static inline void put_write_access(struct inode * inode) -{ - atomic_dec(&inode->i_writecount); -} -static inline void allow_write_access(struct file *file) -{ - if (file) - atomic_inc(&file_inode(file)->i_writecount); -} -static inline bool inode_is_open_for_write(const struct inode *inode) -{ - return atomic_read(&inode->i_writecount) > 0; -} - -#ifdef CONFIG_IMA -static inline void i_readcount_dec(struct inode *inode) -{ - BUG_ON(!atomic_read(&inode->i_readcount)); - atomic_dec(&inode->i_readcount); -} -static inline void i_readcount_inc(struct inode *inode) -{ - atomic_inc(&inode->i_readcount); -} -#else -static inline void i_readcount_dec(struct inode *inode) -{ - return; -} -static inline void i_readcount_inc(struct inode *inode) -{ - return; -} -#endif -extern int do_pipe_flags(int *, int); - -extern int kernel_read(struct file *, loff_t, char *, unsigned long); -extern ssize_t kernel_write(struct file *, const char *, size_t, loff_t); -extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *); -extern struct file * open_exec(const char *); - -/* fs/dcache.c -- generic fs support functions */ -extern int is_subdir(struct dentry *, struct dentry *); -extern int path_is_under(struct path *, struct path *); - -#include <linux/err.h> - -/* needed for stackable file system support */ -extern loff_t default_llseek(struct file *file, loff_t offset, int whence); - -extern loff_t vfs_llseek(struct file *file, loff_t offset, int whence); - -extern int inode_init_always(struct super_block *, struct inode *); -extern void inode_init_once(struct inode *); -extern void address_space_init_once(struct address_space *mapping); -extern struct inode * igrab(struct inode *); -extern ino_t iunique(struct super_block *, ino_t); -extern int inode_needs_sync(struct inode *inode); -extern int generic_delete_inode(struct inode *inode); -static inline int generic_drop_inode(struct inode *inode) -{ - return !inode->i_nlink || inode_unhashed(inode); -} - -extern struct inode *ilookup5_nowait(struct super_block *sb, - unsigned long hashval, int (*test)(struct inode *, void *), - void *data); -extern struct inode *ilookup5(struct super_block *sb, unsigned long hashval, - int (*test)(struct inode *, void *), void *data); -extern struct inode *ilookup(struct super_block *sb, unsigned long ino); - -extern struct inode * iget5_locked(struct super_block *, unsigned long, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *); -extern struct inode * iget_locked(struct super_block *, unsigned long); -extern struct inode *find_inode_nowait(struct super_block *, - unsigned long, - int (*match)(struct inode *, - unsigned long, void *), - void *data); -extern int insert_inode_locked4(struct inode *, unsigned long, int (*test)(struct inode *, void *), void *); -extern int insert_inode_locked(struct inode *); -#ifdef CONFIG_DEBUG_LOCK_ALLOC -extern void lockdep_annotate_inode_mutex_key(struct inode *inode); -#else -static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { }; -#endif -extern void unlock_new_inode(struct inode *); -extern unsigned int get_next_ino(void); - -extern void __iget(struct inode * inode); -extern void iget_failed(struct inode *); -extern void clear_inode(struct inode *); -extern void __destroy_inode(struct inode *); -extern struct inode *new_inode_pseudo(struct super_block *sb); -extern struct inode *new_inode(struct super_block *sb); -extern void free_inode_nonrcu(struct inode *inode); -extern int should_remove_suid(struct dentry *); -extern int file_remove_suid(struct file *); - -extern void __insert_inode_hash(struct inode *, unsigned long hashval); -static inline void insert_inode_hash(struct inode *inode) -{ - __insert_inode_hash(inode, inode->i_ino); -} - -extern void __remove_inode_hash(struct inode *); -static inline void remove_inode_hash(struct inode *inode) -{ - if (!inode_unhashed(inode)) - __remove_inode_hash(inode); -} - -extern void inode_sb_list_add(struct inode *inode); - -#ifdef CONFIG_BLOCK -extern void submit_bio(int, struct bio *); -extern int bdev_read_only(struct block_device *); -#endif -extern int set_blocksize(struct block_device *, int); -extern int sb_set_blocksize(struct super_block *, int); -extern int sb_min_blocksize(struct super_block *, int); - -extern int generic_file_mmap(struct file *, struct vm_area_struct *); -extern int generic_file_readonly_mmap(struct file *, struct vm_area_struct *); -int generic_write_checks(struct file *file, loff_t *pos, size_t *count, int isblk); -extern ssize_t generic_file_read_iter(struct kiocb *, struct iov_iter *); -extern ssize_t __generic_file_write_iter(struct kiocb *, struct iov_iter *); -extern ssize_t generic_file_write_iter(struct kiocb *, struct iov_iter *); -extern ssize_t generic_file_direct_write(struct kiocb *, struct iov_iter *, loff_t); -extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t); -extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); -extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); -extern ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos); -extern ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos); +#include_next <linux/fs.h> ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos); ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos); -/* fs/block_dev.c */ -extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to); -extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from); -extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end, - int datasync); -extern void block_sync_page(struct page *page); - -/* fs/splice.c */ -extern ssize_t generic_file_splice_read(struct file *, loff_t *, - struct pipe_inode_info *, size_t, unsigned int); -extern ssize_t default_file_splice_read(struct file *, loff_t *, - struct pipe_inode_info *, size_t, unsigned int); -extern ssize_t iter_file_splice_write(struct pipe_inode_info *, - struct file *, loff_t *, size_t, unsigned int); -extern ssize_t generic_splice_sendpage(struct pipe_inode_info *pipe, - struct file *out, loff_t *, size_t len, unsigned int flags); -extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out, - loff_t *opos, size_t len, unsigned int flags); - - -extern void -file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping); -extern loff_t noop_llseek(struct file *file, loff_t offset, int whence); -extern loff_t no_llseek(struct file *file, loff_t offset, int whence); -extern loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize); -extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence); -extern loff_t generic_file_llseek_size(struct file *file, loff_t offset, - int whence, loff_t maxsize, loff_t eof); -extern loff_t fixed_size_llseek(struct file *file, loff_t offset, - int whence, loff_t size); -extern int generic_file_open(struct inode * inode, struct file * filp); -extern int nonseekable_open(struct inode * inode, struct file * filp); - -ssize_t dax_do_io(int rw, struct kiocb *, struct inode *, struct iov_iter *, - loff_t, get_block_t, dio_iodone_t, int flags); -int dax_clear_blocks(struct inode *, sector_t block, long size); -int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t); -int dax_truncate_page(struct inode *, loff_t from, get_block_t); -int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t); -#define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb) - -#ifdef CONFIG_BLOCK -typedef void (dio_submit_t)(int rw, struct bio *bio, struct inode *inode, - loff_t file_offset); - -enum { - /* need locking between buffered and direct access */ - DIO_LOCKING = 0x01, - - /* filesystem does not support filling holes */ - DIO_SKIP_HOLES = 0x02, - - /* filesystem can handle aio writes beyond i_size */ - DIO_ASYNC_EXTEND = 0x04, -}; - -void dio_end_io(struct bio *bio, int error); - -ssize_t __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode, - struct block_device *bdev, struct iov_iter *iter, loff_t offset, - get_block_t get_block, dio_iodone_t end_io, - dio_submit_t submit_io, int flags); - -static inline ssize_t blockdev_direct_IO(int rw, struct kiocb *iocb, - struct inode *inode, struct iov_iter *iter, loff_t offset, - get_block_t get_block) -{ - return __blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iter, - offset, get_block, NULL, NULL, - DIO_LOCKING | DIO_SKIP_HOLES); -} -#endif - -void inode_dio_wait(struct inode *inode); -void inode_dio_done(struct inode *inode); - -extern void inode_set_flags(struct inode *inode, unsigned int flags, - unsigned int mask); - -extern const struct file_operations generic_ro_fops; - -#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m)) - -extern int readlink_copy(char __user *, int, const char *); -extern int page_readlink(struct dentry *, char __user *, int); -extern void *page_follow_link_light(struct dentry *, struct nameidata *); -extern void page_put_link(struct dentry *, struct nameidata *, void *); -extern int __page_symlink(struct inode *inode, const char *symname, int len, - int nofs); -extern int page_symlink(struct inode *inode, const char *symname, int len); -extern const struct inode_operations page_symlink_inode_operations; -extern void kfree_put_link(struct dentry *, struct nameidata *, void *); -extern int generic_readlink(struct dentry *, char __user *, int); -extern void generic_fillattr(struct inode *, struct kstat *); -int vfs_getattr_nosec(struct path *path, struct kstat *stat); -extern int vfs_getattr(struct path *, struct kstat *); -void __inode_add_bytes(struct inode *inode, loff_t bytes); -void inode_add_bytes(struct inode *inode, loff_t bytes); -void __inode_sub_bytes(struct inode *inode, loff_t bytes); -void inode_sub_bytes(struct inode *inode, loff_t bytes); -loff_t inode_get_bytes(struct inode *inode); -void inode_set_bytes(struct inode *inode, loff_t bytes); - -extern int vfs_readdir(struct file *, filldir_t, void *); -extern int iterate_dir(struct file *, struct dir_context *); - -extern int vfs_stat(const char __user *, struct kstat *); -extern int vfs_lstat(const char __user *, struct kstat *); -extern int vfs_fstat(unsigned int, struct kstat *); -extern int vfs_fstatat(int , const char __user *, struct kstat *, int); - -extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd, - unsigned long arg); -extern int __generic_block_fiemap(struct inode *inode, - struct fiemap_extent_info *fieinfo, - loff_t start, loff_t len, - get_block_t *get_block); -extern int generic_block_fiemap(struct inode *inode, - struct fiemap_extent_info *fieinfo, u64 start, - u64 len, get_block_t *get_block); - -extern void get_filesystem(struct file_system_type *fs); -extern void put_filesystem(struct file_system_type *fs); -extern struct file_system_type *get_fs_type(const char *name); -extern struct super_block *get_super(struct block_device *); -extern struct super_block *get_super_thawed(struct block_device *); -extern struct super_block *get_active_super(struct block_device *bdev); -extern void drop_super(struct super_block *sb); -extern void iterate_supers(void (*)(struct super_block *, void *), void *); -extern void iterate_supers_type(struct file_system_type *, - void (*)(struct super_block *, void *), void *); - -extern int dcache_dir_open(struct inode *, struct file *); -extern int dcache_dir_close(struct inode *, struct file *); -extern loff_t dcache_dir_lseek(struct file *, loff_t, int); -extern int dcache_readdir(struct file *, struct dir_context *); -extern int simple_setattr(struct dentry *, struct iattr *); -extern int simple_getattr(struct vfsmount *, struct dentry *, struct kstat *); -extern int simple_statfs(struct dentry *, struct kstatfs *); -extern int simple_open(struct inode *inode, struct file *file); -extern int simple_link(struct dentry *, struct inode *, struct dentry *); -extern int simple_unlink(struct inode *, struct dentry *); -extern int simple_rmdir(struct inode *, struct dentry *); -extern int simple_rename(struct inode *, struct dentry *, struct inode *, struct dentry *); -extern int noop_fsync(struct file *, loff_t, loff_t, int); -extern int simple_empty(struct dentry *); -extern int simple_readpage(struct file *file, struct page *page); -extern int simple_write_begin(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata); -extern int simple_write_end(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *page, void *fsdata); -extern int always_delete_dentry(const struct dentry *); -extern struct inode *alloc_anon_inode(struct super_block *); -extern int simple_nosetlease(struct file *, long, struct file_lock **, void **); -extern const struct dentry_operations simple_dentry_operations; - -extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags); -extern ssize_t generic_read_dir(struct file *, char __user *, size_t, loff_t *); -extern const struct file_operations simple_dir_operations; -extern const struct inode_operations simple_dir_inode_operations; -struct tree_descr { char *name; const struct file_operations *ops; int mode; }; -struct dentry *d_alloc_name(struct dentry *, const char *); -extern int simple_fill_super(struct super_block *, unsigned long, struct tree_descr *); -extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count); -extern void simple_release_fs(struct vfsmount **mount, int *count); - -extern ssize_t simple_read_from_buffer(void __user *to, size_t count, - loff_t *ppos, const void *from, size_t available); -extern ssize_t simple_write_to_buffer(void *to, size_t available, loff_t *ppos, - const void __user *from, size_t count); - -extern int __generic_file_fsync(struct file *, loff_t, loff_t, int); -extern int generic_file_fsync(struct file *, loff_t, loff_t, int); - -extern int generic_check_addressable(unsigned, u64); - -#ifdef CONFIG_MIGRATION -extern int buffer_migrate_page(struct address_space *, - struct page *, struct page *, - enum migrate_mode); -#else -#define buffer_migrate_page NULL -#endif - -extern int inode_change_ok(const struct inode *, struct iattr *); -extern int inode_newsize_ok(const struct inode *, loff_t offset); -extern void setattr_copy(struct inode *inode, const struct iattr *attr); - -extern int file_update_time(struct file *file); - -extern int generic_show_options(struct seq_file *m, struct dentry *root); -extern void save_mount_options(struct super_block *sb, char *options); -extern void replace_mount_options(struct super_block *sb, char *options); - -static inline bool io_is_direct(struct file *filp) -{ - return (filp->f_flags & O_DIRECT) || IS_DAX(file_inode(filp)); -} - -static inline ino_t parent_ino(struct dentry *dentry) -{ - ino_t res; - - /* - * Don't strictly need d_lock here? If the parent ino could change - * then surely we'd have a deeper race in the caller? - */ - spin_lock(&dentry->d_lock); - res = dentry->d_parent->d_inode->i_ino; - spin_unlock(&dentry->d_lock); - return res; -} - -/* Transaction based IO helpers */ - -/* - * An argresp is stored in an allocated page and holds the - * size of the argument or response, along with its content - */ -struct simple_transaction_argresp { - ssize_t size; - char data[0]; -}; - -#define SIMPLE_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct simple_transaction_argresp)) - -char *simple_transaction_get(struct file *file, const char __user *buf, - size_t size); -ssize_t simple_transaction_read(struct file *file, char __user *buf, - size_t size, loff_t *pos); -int simple_transaction_release(struct inode *inode, struct file *file); - -void simple_transaction_set(struct file *file, size_t n); - -/* - * simple attribute files - * - * These attributes behave similar to those in sysfs: - * - * Writing to an attribute immediately sets a value, an open file can be - * written to multiple times. - * - * Reading from an attribute creates a buffer from the value that might get - * read with multiple read calls. When the attribute has been read - * completely, no further read calls are possible until the file is opened - * again. - * - * All attributes contain a text representation of a numeric value - * that are accessed with the get() and set() functions. - */ -#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt) \ -static int __fops ## _open(struct inode *inode, struct file *file) \ -{ \ - __simple_attr_check_format(__fmt, 0ull); \ - return simple_attr_open(inode, file, __get, __set, __fmt); \ -} \ -static const struct file_operations __fops = { \ - .owner = THIS_MODULE, \ - .open = __fops ## _open, \ - .release = simple_attr_release, \ - .read = simple_attr_read, \ - .write = simple_attr_write, \ - .llseek = generic_file_llseek, \ -} - -static inline __printf(1, 2) -void __simple_attr_check_format(const char *fmt, ...) -{ - /* don't do anything, just let the compiler check the arguments; */ -} - -int simple_attr_open(struct inode *inode, struct file *file, - int (*get)(void *, u64 *), int (*set)(void *, u64), - const char *fmt); -int simple_attr_release(struct inode *inode, struct file *file); -ssize_t simple_attr_read(struct file *file, char __user *buf, - size_t len, loff_t *ppos); -ssize_t simple_attr_write(struct file *file, const char __user *buf, - size_t len, loff_t *ppos); - -struct ctl_table; -int proc_nr_files(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos); -int proc_nr_dentry(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos); -int proc_nr_inodes(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos); -int __init get_filesystem_list(char *buf); - -#define __FMODE_EXEC ((__force int) FMODE_EXEC) -#define __FMODE_NONOTIFY ((__force int) FMODE_NONOTIFY) - -#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE]) -#define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \ - (flag & __FMODE_NONOTIFY))) - -static inline int is_sxid(umode_t mode) -{ - return (mode & S_ISUID) || ((mode & S_ISGID) && (mode & S_IXGRP)); -} - -static inline int check_sticky(struct inode *dir, struct inode *inode) -{ - if (!(dir->i_mode & S_ISVTX)) - return 0; - - return __check_sticky(dir, inode); -} - -static inline void inode_has_no_xattr(struct inode *inode) -{ - if (!is_sxid(inode->i_mode) && (inode->i_sb->s_flags & MS_NOSEC)) - inode->i_flags |= S_NOSEC; -} - -static inline bool is_root_inode(struct inode *inode) -{ - return inode == inode->i_sb->s_root->d_inode; -} - -static inline bool dir_emit(struct dir_context *ctx, - const char *name, int namelen, - u64 ino, unsigned type) -{ - return ctx->actor(ctx, name, namelen, ctx->pos, ino, type) == 0; -} -static inline bool dir_emit_dot(struct file *file, struct dir_context *ctx) -{ - return ctx->actor(ctx, ".", 1, ctx->pos, - file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0; -} -static inline bool dir_emit_dotdot(struct file *file, struct dir_context *ctx) -{ - return ctx->actor(ctx, "..", 2, ctx->pos, - parent_ino(file->f_path.dentry), DT_DIR) == 0; -} -static inline bool dir_emit_dots(struct file *file, struct dir_context *ctx) -{ - if (ctx->pos == 0) { - if (!dir_emit_dot(file, ctx)) - return false; - ctx->pos = 1; - } - if (ctx->pos == 1) { - if (!dir_emit_dotdot(file, ctx)) - return false; - ctx->pos = 2; - } - return true; -} -static inline bool dir_relax(struct inode *inode) -{ - mutex_unlock(&inode->i_mutex); - mutex_lock(&inode->i_mutex); - return !IS_DEADDIR(inode); -} - -#endif /* _LINUX_FS_H */ +#endif /* _COMPAT_LINUX_FS_H */ diff --git a/compat/include/linux/list_lru.h b/compat/include/linux/list_lru.h deleted file mode 100644 index 2a6b9947aaa..00000000000 --- a/compat/include/linux/list_lru.h +++ /dev/null @@ -1,189 +0,0 @@ -/* - * Copyright (c) 2013 Red Hat, Inc. and Parallels Inc. All rights reserved. - * Authors: David Chinner and Glauber Costa - * - * Generic LRU infrastructure - */ -#ifndef _LRU_LIST_H -#define _LRU_LIST_H - -#include <linux/list.h> -#include <linux/nodemask.h> -#include <linux/shrinker.h> - -struct mem_cgroup; - -/* list_lru_walk_cb has to always return one of those */ -enum lru_status { - LRU_REMOVED, /* item removed from list */ - LRU_REMOVED_RETRY, /* item removed, but lock has been - dropped and reacquired */ - LRU_ROTATE, /* item referenced, give another pass */ - LRU_SKIP, /* item cannot be locked, skip */ - LRU_RETRY, /* item not freeable. May drop the lock - internally, but has to return locked. */ -}; - -struct list_lru_one { - struct list_head list; - /* may become negative during memcg reparenting */ - long nr_items; -}; - -struct list_lru_memcg { - /* array of per cgroup lists, indexed by memcg_cache_id */ - struct list_lru_one *lru[0]; -}; - -struct list_lru_node { - /* protects all lists on the node, including per cgroup */ - spinlock_t lock; - /* global list, used for the root cgroup in cgroup aware lrus */ - struct list_lru_one lru; -#ifdef CONFIG_MEMCG_KMEM - /* for cgroup aware lrus points to per cgroup lists, otherwise NULL */ - struct list_lru_memcg *memcg_lrus; -#endif -} ____cacheline_aligned_in_smp; - -struct list_lru { - struct list_lru_node *node; -#ifdef CONFIG_MEMCG_KMEM - struct list_head list; -#endif -}; - -void list_lru_destroy(struct list_lru *lru); -int __list_lru_init(struct list_lru *lru, bool memcg_aware, - struct lock_class_key *key); - -#define list_lru_init(lru) __list_lru_init((lru), false, NULL) -#define list_lru_init_key(lru, key) __list_lru_init((lru), false, (key)) -#define list_lru_init_memcg(lru) __list_lru_init((lru), true, NULL) - -int memcg_update_all_list_lrus(int num_memcgs); -void memcg_drain_all_list_lrus(int src_idx, int dst_idx); - -/** - * list_lru_add: add an element to the lru list's tail - * @list_lru: the lru pointer - * @item: the item to be added. - * - * If the element is already part of a list, this function returns doing - * nothing. Therefore the caller does not need to keep state about whether or - * not the element already belongs in the list and is allowed to lazy update - * it. Note however that this is valid for *a* list, not *this* list. If - * the caller organize itself in a way that elements can be in more than - * one type of list, it is up to the caller to fully remove the item from - * the previous list (with list_lru_del() for instance) before moving it - * to @list_lru - * - * Return value: true if the list was updated, false otherwise - */ -bool list_lru_add(struct list_lru *lru, struct list_head *item); - -/** - * list_lru_del: delete an element to the lru list - * @list_lru: the lru pointer - * @item: the item to be deleted. - * - * This function works analogously as list_lru_add in terms of list - * manipulation. The comments about an element already pertaining to - * a list are also valid for list_lru_del. - * - * Return value: true if the list was updated, false otherwise - */ -bool list_lru_del(struct list_lru *lru, struct list_head *item); - -/** - * list_lru_count_one: return the number of objects currently held by @lru - * @lru: the lru pointer. - * @nid: the node id to count from. - * @memcg: the cgroup to count from. - * - * Always return a non-negative number, 0 for empty lists. There is no - * guarantee that the list is not updated while the count is being computed. - * Callers that want such a guarantee need to provide an outer lock. - */ -unsigned long list_lru_count_one(struct list_lru *lru, - int nid, struct mem_cgroup *memcg); -unsigned long list_lru_count_node(struct list_lru *lru, int nid); - -static inline unsigned long list_lru_shrink_count(struct list_lru *lru, - struct shrink_control *sc) -{ - return list_lru_count_one(lru, sc->nid, sc->memcg); -} - -static inline unsigned long list_lru_count(struct list_lru *lru) -{ - long count = 0; - int nid; - - for_each_node_state(nid, N_NORMAL_MEMORY) - count += list_lru_count_node(lru, nid); - - return count; -} - -void list_lru_isolate(struct list_lru_one *list, struct list_head *item); -void list_lru_isolate_move(struct list_lru_one *list, struct list_head *item, - struct list_head *head); - -typedef enum lru_status (*list_lru_walk_cb)(struct list_head *item, - struct list_lru_one *list, spinlock_t *lock, void *cb_arg); - -/** - * list_lru_walk_one: walk a list_lru, isolating and disposing freeable items. - * @lru: the lru pointer. - * @nid: the node id to scan from. - * @memcg: the cgroup to scan from. - * @isolate: callback function that is resposible for deciding what to do with - * the item currently being scanned - * @cb_arg: opaque type that will be passed to @isolate - * @nr_to_walk: how many items to scan. - * - * This function will scan all elements in a particular list_lru, calling the - * @isolate callback for each of those items, along with the current list - * spinlock and a caller-provided opaque. The @isolate callback can choose to - * drop the lock internally, but *must* return with the lock held. The callback - * will return an enum lru_status telling the list_lru infrastructure what to - * do with the object being scanned. - * - * Please note that nr_to_walk does not mean how many objects will be freed, - * just how many objects will be scanned. - * - * Return value: the number of objects effectively removed from the LRU. - */ -unsigned long list_lru_walk_one(struct list_lru *lru, - int nid, struct mem_cgroup *memcg, - list_lru_walk_cb isolate, void *cb_arg, - unsigned long *nr_to_walk); -unsigned long list_lru_walk_node(struct list_lru *lru, int nid, - list_lru_walk_cb isolate, void *cb_arg, - unsigned long *nr_to_walk); - -static inline unsigned long -list_lru_shrink_walk(struct list_lru *lru, struct shrink_control *sc, - list_lru_walk_cb isolate, void *cb_arg) -{ - return list_lru_walk_one(lru, sc->nid, sc->memcg, isolate, cb_arg, - &sc->nr_to_scan); -} - -static inline unsigned long -list_lru_walk(struct list_lru *lru, list_lru_walk_cb isolate, - void *cb_arg, unsigned long nr_to_walk) -{ - long isolated = 0; - int nid; - - for_each_node_state(nid, N_NORMAL_MEMORY) { - isolated += list_lru_walk_node(lru, nid, isolate, - cb_arg, &nr_to_walk); - if (nr_to_walk <= 0) - break; - } - return isolated; -} -#endif /* _LRU_LIST_H */ diff --git a/compat/include/linux/mm.h b/compat/include/linux/mm.h new file mode 100644 index 00000000000..9208fe94875 --- /dev/null +++ b/compat/include/linux/mm.h @@ -0,0 +1,8 @@ +#ifndef __COMPAT_LINUX_MM_H +#define __COMPAT_LINUX_MM_H + +#include_next <linux/mm.h> + +extern void truncate_inode_pages_final(struct address_space *); + +#endif /* _COMPAT_LINUX_MM_H */ diff --git a/compat/include/linux/pagemap.h b/compat/include/linux/pagemap.h new file mode 100644 index 00000000000..a305dc94dcc --- /dev/null +++ b/compat/include/linux/pagemap.h @@ -0,0 +1,18 @@ +#ifndef __COMPAT_LINUX_PAGEMAP_H +#define __COMPAT_LINUX_PAGEMAP_H + +#include_next <linux/pagemap.h> + +#define AS_EXITING (__GFP_BITS_SHIFT + 5) /* final truncate in progress */ + +static inline void mapping_set_exiting(struct address_space *mapping) +{ + set_bit(AS_EXITING, &mapping->flags); +} + +static inline int mapping_exiting(struct address_space *mapping) +{ + return test_bit(AS_EXITING, &mapping->flags); +} + +#endif /* _COMPAT_LINUX_PAGEMAP_H */ diff --git a/compat/include/linux/shrinker.h b/compat/include/linux/shrinker.h deleted file mode 100644 index 4fcacd915d4..00000000000 --- a/compat/include/linux/shrinker.h +++ /dev/null @@ -1,72 +0,0 @@ -#ifndef _LINUX_SHRINKER_H -#define _LINUX_SHRINKER_H - -/* - * This struct is used to pass information from page reclaim to the shrinkers. - * We consolidate the values for easier extention later. - * - * The 'gfpmask' refers to the allocation we are currently trying to - * fulfil. - */ -struct shrink_control { - gfp_t gfp_mask; - - /* - * How many objects scan_objects should scan and try to reclaim. - * This is reset before every call, so it is safe for callees - * to modify. - */ - unsigned long nr_to_scan; - - /* current node being shrunk (for NUMA aware shrinkers) */ - int nid; - - /* current memcg being shrunk (for memcg aware shrinkers) */ - struct mem_cgroup *memcg; -}; - -#define SHRINK_STOP (~0UL) -/* - * A callback you can register to apply pressure to ageable caches. - * - * @count_objects should return the number of freeable items in the cache. If - * there are no objects to free or the number of freeable items cannot be - * determined, it should return 0. No deadlock checks should be done during the - * count callback - the shrinker relies on aggregating scan counts that couldn't - * be executed due to potential deadlocks to be run at a later call when the - * deadlock condition is no longer pending. - * - * @scan_objects will only be called if @count_objects returned a non-zero - * value for the number of freeable objects. The callout should scan the cache - * and attempt to free items from the cache. It should then return the number - * of objects freed during the scan, or SHRINK_STOP if progress cannot be made - * due to potential deadlocks. If SHRINK_STOP is returned, then no further - * attempts to call the @scan_objects will be made from the current reclaim - * context. - * - * @flags determine the shrinker abilities, like numa awareness - */ -struct shrinker { - unsigned long (*count_objects)(struct shrinker *, - struct shrink_control *sc); - unsigned long (*scan_objects)(struct shrinker *, - struct shrink_control *sc); - - int seeks; /* seeks to recreate an obj */ - long batch; /* reclaim batch size, 0 = default */ - unsigned long flags; - - /* These are for internal use */ - struct list_head list; - /* objs pending delete, per node */ - atomic_long_t *nr_deferred; -}; -#define DEFAULT_SEEKS 2 /* A good number if you don't know better. */ - -/* Flags */ -#define SHRINKER_NUMA_AWARE (1 << 0) -#define SHRINKER_MEMCG_AWARE (1 << 1) - -extern int register_shrinker(struct shrinker *); -extern void unregister_shrinker(struct shrinker *); -#endif diff --git a/compat/include/linux/uio.h b/compat/include/linux/uio.h index b691aa5fa9c..84fcb4eac6c 100644 --- a/compat/include/linux/uio.h +++ b/compat/include/linux/uio.h @@ -1,26 +1,11 @@ -/* - * Berkeley style UIO structures - Alan Cox 1994. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ -#ifndef __LINUX_UIO_H -#define __LINUX_UIO_H +#ifndef __COMPAT_LINUX_UIO_H +#define __COMPAT_LINUX_UIO_H -#include <linux/kernel.h> -#include <uapi/linux/uio.h> +#include_next <linux/uio.h> /* other compatibility headers */ #include <linux/time64.h> - -struct page; - -struct kvec { - void *iov_base; /* and that should *never* hold a userland pointer */ - size_t iov_len; -}; +#include <linux/fs.h> enum { ITER_IOVEC = 0, @@ -28,118 +13,10 @@ enum { ITER_BVEC = 4, }; -struct iov_iter { - int type; - size_t iov_offset; - size_t count; - union { - const struct iovec *iov; - const struct kvec *kvec; - const struct bio_vec *bvec; - }; - unsigned long nr_segs; -}; - -/* - * Total number of bytes covered by an iovec. - * - * NOTE that it is not safe to use this function until all the iovec's - * segment lengths have been validated. Because the individual lengths can - * overflow a size_t when added together. - */ -static inline size_t iov_length(const struct iovec *iov, unsigned long nr_segs) -{ - unsigned long seg; - size_t ret = 0; - - for (seg = 0; seg < nr_segs; seg++) - ret += iov[seg].iov_len; - return ret; -} - -static inline struct iovec iov_iter_iovec(const struct iov_iter *iter) -{ - return (struct iovec) { - .iov_base = iter->iov->iov_base + iter->iov_offset, - .iov_len = min(iter->count, - iter->iov->iov_len - iter->iov_offset), - }; -} - -#define iov_for_each(iov, iter, start) \ - if (!((start).type & ITER_BVEC)) \ - for (iter = (start); \ - (iter).count && \ - ((iov = iov_iter_iovec(&(iter))), 1); \ - iov_iter_advance(&(iter), (iov).iov_len)) - -unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to); - -size_t iov_iter_copy_from_user_atomic(struct page *page, - struct iov_iter *i, unsigned long offset, size_t bytes); -void iov_iter_advance(struct iov_iter *i, size_t bytes); -int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes); -size_t iov_iter_single_seg_count(const struct iov_iter *i); -size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes, - struct iov_iter *i); -size_t copy_page_from_iter(struct page *page, size_t offset, size_t bytes, - struct iov_iter *i); -size_t copy_to_iter(void *addr, size_t bytes, struct iov_iter *i); -size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i); -size_t copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i); -size_t iov_iter_zero(size_t bytes, struct iov_iter *); -unsigned long iov_iter_alignment(const struct iov_iter *i); void iov_iter_init(struct iov_iter *i, int direction, const struct iovec *iov, unsigned long nr_segs, size_t count); + void iov_iter_kvec(struct iov_iter *i, int direction, const struct kvec *kvec, unsigned long nr_segs, size_t count); -void iov_iter_bvec(struct iov_iter *i, int direction, const struct bio_vec *bvec, - unsigned long nr_segs, size_t count); -ssize_t iov_iter_get_pages(struct iov_iter *i, struct page **pages, - size_t maxsize, unsigned maxpages, size_t *start); -ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, struct page ***pages, - size_t maxsize, size_t *start); -int iov_iter_npages(const struct iov_iter *i, int maxpages); - -const void *dup_iter(struct iov_iter *new, struct iov_iter *old, gfp_t flags); - -static inline size_t iov_iter_count(struct iov_iter *i) -{ - return i->count; -} - -static inline bool iter_is_iovec(struct iov_iter *i) -{ - return !(i->type & (ITER_BVEC | ITER_KVEC)); -} - -/* - * Cap the iov_iter by given limit; note that the second argument is - * *not* the new size - it's upper limit for such. Passing it a value - * greater than the amount of data in iov_iter is fine - it'll just do - * nothing in that case. - */ -static inline void iov_iter_truncate(struct iov_iter *i, u64 count) -{ - /* - * count doesn't have to fit in size_t - comparison extends both - * operands to u64 here and any value that would be truncated by - * conversion in assignement is by definition greater than all - * values of size_t, including old i->count. - */ - if (i->count > count) - i->count = count; -} - -/* - * reexpand a previously truncated iterator; count must be no more than how much - * we had shrunk it. - */ -static inline void iov_iter_reexpand(struct iov_iter *i, size_t count) -{ - i->count = count; -} -size_t csum_and_copy_to_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i); -size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i); -#endif +#endif /* _COMPAT_LINUX_UIO_H */ diff --git a/compat/mm/Makefile b/compat/mm/Makefile new file mode 100644 index 00000000000..79502e491d7 --- /dev/null +++ b/compat/mm/Makefile @@ -0,0 +1 @@ +obj-y += truncate.o diff --git a/compat/mm/truncate.c b/compat/mm/truncate.c new file mode 100644 index 00000000000..83016e60210 --- /dev/null +++ b/compat/mm/truncate.c @@ -0,0 +1,62 @@ +#include <linux/kernel.h> +#include <linux/backing-dev.h> +#include <linux/gfp.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/export.h> +#include <linux/pagemap.h> +#include <linux/highmem.h> +#include <linux/pagevec.h> +#include <linux/task_io_accounting_ops.h> +#include <linux/buffer_head.h> /* grr. try_to_release_page, + do_invalidatepage */ +#include <linux/cleancache.h> +#include <linux/rmap.h> + +#include <linux/fs.h> +#include <linux/mm.h> + +/** + * truncate_inode_pages_final - truncate *all* pages before inode dies + * @mapping: mapping to truncate + * + * Called under (and serialized by) inode->i_mutex. + * + * Filesystems have to use this in the .evict_inode path to inform the + * VM that this is the final truncate and the inode is going away. + */ +void truncate_inode_pages_final(struct address_space *mapping) +{ + unsigned long nrpages; + + /* + * Page reclaim can not participate in regular inode lifetime + * management (can't call iput()) and thus can race with the + * inode teardown. Tell it when the address space is exiting, + * so that it does not install eviction information after the + * final truncate has begun. + */ + mapping_set_exiting(mapping); + + /* + * When reclaim installs eviction entries, it increases + * nrshadows first, then decreases nrpages. Make sure we see + * this in the right order or we might miss an entry. + */ + nrpages = mapping->nrpages; + smp_rmb(); + + if (nrpages) { + /* + * As truncation uses a lockless tree lookup, cycle + * the tree lock to make sure any ongoing tree + * modification that does not see AS_EXITING is + * completed before starting the final truncate. + */ + spin_lock_irq(&mapping->tree_lock); + spin_unlock_irq(&mapping->tree_lock); + + truncate_inode_pages(mapping, 0); + } +} +EXPORT_SYMBOL(truncate_inode_pages_final); diff --git a/include/linux/fs.h b/include/linux/fs.h index aacddc73462..bc56c5de316 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -289,10 +289,15 @@ struct address_space; struct writeback_control; struct iov_iter { - const struct iovec *iov; - unsigned long nr_segs; + int type; size_t iov_offset; size_t count; + union { + const struct iovec *iov; + const struct kvec *kvec; + const struct bio_vec *bvec; + }; + unsigned long nr_segs; }; size_t iov_iter_copy_from_user_atomic(struct page *page, @@ -303,6 +308,7 @@ void iov_iter_advance(struct iov_iter *i, size_t bytes); int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes); size_t iov_iter_single_seg_count(const struct iov_iter *i); +#ifndef _COMPAT_LINUX_FS_H static inline void iov_iter_init(struct iov_iter *i, const struct iovec *iov, unsigned long nr_segs, size_t count, size_t written) @@ -314,6 +320,7 @@ static inline void iov_iter_init(struct iov_iter *i, iov_iter_advance(i, written); } +#endif static inline size_t iov_iter_count(struct iov_iter *i) { @@ -1551,6 +1558,8 @@ struct file_operations { ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); + ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); + ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); int (*iterate) (struct file *, struct dir_context *); unsigned int (*poll) (struct file *, struct poll_table_struct *); long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); |