diff options
| -rw-r--r-- | fs/configfs/inode.c | 2 | ||||
| -rw-r--r-- | fs/hugetlbfs/inode.c | 2 | ||||
| -rw-r--r-- | fs/ocfs2/dlm/dlmfs.c | 2 | ||||
| -rw-r--r-- | fs/ramfs/inode.c | 2 | ||||
| -rw-r--r-- | fs/sysfs/inode.c | 2 | ||||
| -rw-r--r-- | include/linux/backing-dev.h | 77 | ||||
| -rw-r--r-- | kernel/cgroup.c | 2 | ||||
| -rw-r--r-- | mm/page-writeback.c | 4 | ||||
| -rw-r--r-- | mm/shmem.c | 2 | ||||
| -rw-r--r-- | mm/swap_state.c | 2 |
10 files changed, 67 insertions, 30 deletions
diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c index 4c1ebff778e..b9a1d810346 100644 --- a/fs/configfs/inode.c +++ b/fs/configfs/inode.c @@ -47,7 +47,7 @@ static const struct address_space_operations configfs_aops = { static struct backing_dev_info configfs_backing_dev_info = { .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, + .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, }; static const struct inode_operations configfs_inode_operations ={ diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 9783723e8ff..aeabf80f81a 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -45,7 +45,7 @@ static const struct inode_operations hugetlbfs_inode_operations; static struct backing_dev_info hugetlbfs_backing_dev_info = { .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, + .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, }; int sysctl_hugetlb_shm_group; diff --git a/fs/ocfs2/dlm/dlmfs.c b/fs/ocfs2/dlm/dlmfs.c index 61a000f8524..e48aba698b7 100644 --- a/fs/ocfs2/dlm/dlmfs.c +++ b/fs/ocfs2/dlm/dlmfs.c @@ -327,7 +327,7 @@ clear_fields: static struct backing_dev_info dlmfs_backing_dev_info = { .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, + .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, }; static struct inode *dlmfs_get_root_inode(struct super_block *sb) diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c index 8428d5b2711..b13123424e4 100644 --- a/fs/ramfs/inode.c +++ b/fs/ramfs/inode.c @@ -44,7 +44,7 @@ static const struct inode_operations ramfs_dir_inode_operations; static struct backing_dev_info ramfs_backing_dev_info = { .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK | + .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK | BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY | BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP, }; diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c index d9262f74f94..f8b82e73b3b 100644 --- a/fs/sysfs/inode.c +++ b/fs/sysfs/inode.c @@ -30,7 +30,7 @@ static const struct address_space_operations sysfs_aops = { static struct backing_dev_info sysfs_backing_dev_info = { .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, + .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, }; static const struct inode_operations sysfs_inode_operations ={ diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index c49a2d045e1..13ab79d9926 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -12,6 +12,7 @@ #include <linux/log2.h> #include <linux/proportions.h> #include <linux/kernel.h> +#include <linux/fs.h> #include <asm/atomic.h> struct page; @@ -151,22 +152,43 @@ int bdi_set_max_ratio(struct backing_dev_info *bdi, unsigned int max_ratio); /* * Flags in backing_dev_info::capability - * - The first two flags control whether dirty pages will contribute to the - * VM's accounting and whether writepages() should be called for dirty pages - * (something that would not, for example, be appropriate for ramfs) - * - These flags let !MMU mmap() govern direct device mapping vs immediate - * copying more easily for MAP_PRIVATE, especially for ROM filesystems + * + * The first three flags control whether dirty pages will contribute to the + * VM's accounting and whether writepages() should be called for dirty pages + * (something that would not, for example, be appropriate for ramfs) + * + * WARNING: these flags are closely related and should not normally be + * used separately. The BDI_CAP_NO_ACCT_AND_WRITEBACK combines these + * three flags into a single convenience macro. + * + * BDI_CAP_NO_ACCT_DIRTY: Dirty pages shouldn't contribute to accounting + * BDI_CAP_NO_WRITEBACK: Don't write pages back + * BDI_CAP_NO_ACCT_WB: Don't automatically account writeback pages + * + * These flags let !MMU mmap() govern direct device mapping vs immediate + * copying more easily for MAP_PRIVATE, especially for ROM filesystems. + * + * BDI_CAP_MAP_COPY: Copy can be mapped (MAP_PRIVATE) + * BDI_CAP_MAP_DIRECT: Can be mapped directly (MAP_SHARED) + * BDI_CAP_READ_MAP: Can be mapped for reading + * BDI_CAP_WRITE_MAP: Can be mapped for writing + * BDI_CAP_EXEC_MAP: Can be mapped for execution */ -#define BDI_CAP_NO_ACCT_DIRTY 0x00000001 /* Dirty pages shouldn't contribute to accounting */ -#define BDI_CAP_NO_WRITEBACK 0x00000002 /* Don't write pages back */ -#define BDI_CAP_MAP_COPY 0x00000004 /* Copy can be mapped (MAP_PRIVATE) */ -#define BDI_CAP_MAP_DIRECT 0x00000008 /* Can be mapped directly (MAP_SHARED) */ -#define BDI_CAP_READ_MAP 0x00000010 /* Can be mapped for reading */ -#define BDI_CAP_WRITE_MAP 0x00000020 /* Can be mapped for writing */ -#define BDI_CAP_EXEC_MAP 0x00000040 /* Can be mapped for execution */ +#define BDI_CAP_NO_ACCT_DIRTY 0x00000001 +#define BDI_CAP_NO_WRITEBACK 0x00000002 +#define BDI_CAP_MAP_COPY 0x00000004 +#define BDI_CAP_MAP_DIRECT 0x00000008 +#define BDI_CAP_READ_MAP 0x00000010 +#define BDI_CAP_WRITE_MAP 0x00000020 +#define BDI_CAP_EXEC_MAP 0x00000040 +#define BDI_CAP_NO_ACCT_WB 0x00000080 + #define BDI_CAP_VMFLAGS \ (BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP) +#define BDI_CAP_NO_ACCT_AND_WRITEBACK \ + (BDI_CAP_NO_WRITEBACK | BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_ACCT_WB) + #if defined(VM_MAYREAD) && \ (BDI_CAP_READ_MAP != VM_MAYREAD || \ BDI_CAP_WRITE_MAP != VM_MAYWRITE || \ @@ -206,17 +228,32 @@ void clear_bdi_congested(struct backing_dev_info *bdi, int rw); void set_bdi_congested(struct backing_dev_info *bdi, int rw); long congestion_wait(int rw, long timeout); -#define bdi_cap_writeback_dirty(bdi) \ - (!((bdi)->capabilities & BDI_CAP_NO_WRITEBACK)) -#define bdi_cap_account_dirty(bdi) \ - (!((bdi)->capabilities & BDI_CAP_NO_ACCT_DIRTY)) +static inline bool bdi_cap_writeback_dirty(struct backing_dev_info *bdi) +{ + return !(bdi->capabilities & BDI_CAP_NO_WRITEBACK); +} + +static inline bool bdi_cap_account_dirty(struct backing_dev_info *bdi) +{ + return !(bdi->capabilities & BDI_CAP_NO_ACCT_DIRTY); +} -#define mapping_cap_writeback_dirty(mapping) \ - bdi_cap_writeback_dirty((mapping)->backing_dev_info) +static inline bool bdi_cap_account_writeback(struct backing_dev_info *bdi) +{ + /* Paranoia: BDI_CAP_NO_WRITEBACK implies BDI_CAP_NO_ACCT_WB */ + return !(bdi->capabilities & (BDI_CAP_NO_ACCT_WB | + BDI_CAP_NO_WRITEBACK)); +} -#define mapping_cap_account_dirty(mapping) \ - bdi_cap_account_dirty((mapping)->backing_dev_info) +static inline bool mapping_cap_writeback_dirty(struct address_space *mapping) +{ + return bdi_cap_writeback_dirty(mapping->backing_dev_info); +} +static inline bool mapping_cap_account_dirty(struct address_space *mapping) +{ + return bdi_cap_account_dirty(mapping->backing_dev_info); +} #endif /* _LINUX_BACKING_DEV_H */ diff --git a/kernel/cgroup.c b/kernel/cgroup.c index b9d467d83fc..fbc6fc8949b 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -575,7 +575,7 @@ static struct inode_operations cgroup_dir_inode_operations; static struct file_operations proc_cgroupstats_operations; static struct backing_dev_info cgroup_backing_dev_info = { - .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, + .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, }; static struct inode *cgroup_new_inode(mode_t mode, struct super_block *sb) diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 2a9942f5387..bbcb916190c 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1246,7 +1246,7 @@ int test_clear_page_writeback(struct page *page) radix_tree_tag_clear(&mapping->page_tree, page_index(page), PAGECACHE_TAG_WRITEBACK); - if (bdi_cap_writeback_dirty(bdi)) { + if (bdi_cap_account_writeback(bdi)) { __dec_bdi_stat(bdi, BDI_WRITEBACK); __bdi_writeout_inc(bdi); } @@ -1275,7 +1275,7 @@ int test_set_page_writeback(struct page *page) radix_tree_tag_set(&mapping->page_tree, page_index(page), PAGECACHE_TAG_WRITEBACK); - if (bdi_cap_writeback_dirty(bdi)) + if (bdi_cap_account_writeback(bdi)) __inc_bdi_stat(bdi, BDI_WRITEBACK); } if (!PageDirty(page)) diff --git a/mm/shmem.c b/mm/shmem.c index e6d9298aa22..e2a6ae1a44e 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -201,7 +201,7 @@ static struct vm_operations_struct shmem_vm_ops; static struct backing_dev_info shmem_backing_dev_info __read_mostly = { .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, + .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, .unplug_io_fn = default_unplug_io_fn, }; diff --git a/mm/swap_state.c b/mm/swap_state.c index 50757ee3f9f..d8aadaf2a0b 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -33,7 +33,7 @@ static const struct address_space_operations swap_aops = { }; static struct backing_dev_info swap_backing_dev_info = { - .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, + .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, .unplug_io_fn = swap_unplug_io_fn, }; 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