diff options
Diffstat (limited to 'fs/gfs2/inode.c')
| -rw-r--r-- | fs/gfs2/inode.c | 1990 |
1 files changed, 1990 insertions, 0 deletions
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c new file mode 100644 index 00000000000..a783a7a8c0c --- /dev/null +++ b/fs/gfs2/inode.c @@ -0,0 +1,1990 @@ +/* + * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. + * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. + * + * This copyrighted material is made available to anyone wishing to use, + * modify, copy, or redistribute it subject to the terms and conditions + * of the GNU General Public License version 2. + */ + +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/completion.h> +#include <linux/buffer_head.h> +#include <linux/namei.h> +#include <linux/mm.h> +#include <linux/xattr.h> +#include <linux/posix_acl.h> +#include <linux/gfs2_ondisk.h> +#include <linux/crc32.h> +#include <linux/fiemap.h> +#include <linux/security.h> +#include <asm/uaccess.h> + +#include "gfs2.h" +#include "incore.h" +#include "acl.h" +#include "bmap.h" +#include "dir.h" +#include "xattr.h" +#include "glock.h" +#include "inode.h" +#include "meta_io.h" +#include "quota.h" +#include "rgrp.h" +#include "trans.h" +#include "util.h" +#include "super.h" +#include "glops.h" + +struct gfs2_skip_data { + u64 no_addr; + int skipped; + int non_block; +}; + +static int iget_test(struct inode *inode, void *opaque) +{ + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_skip_data *data = opaque; + + if (ip->i_no_addr == data->no_addr) { + if (data->non_block && + inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)) { + data->skipped = 1; + return 0; + } + return 1; + } + return 0; +} + +static int iget_set(struct inode *inode, void *opaque) +{ + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_skip_data *data = opaque; + + if (data->skipped) + return -ENOENT; + inode->i_ino = (unsigned long)(data->no_addr); + ip->i_no_addr = data->no_addr; + return 0; +} + +struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int non_block) +{ + unsigned long hash = (unsigned long)no_addr; + struct gfs2_skip_data data; + + data.no_addr = no_addr; + data.skipped = 0; + data.non_block = non_block; + return ilookup5(sb, hash, iget_test, &data); +} + +static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr, + int non_block) +{ + struct gfs2_skip_data data; + unsigned long hash = (unsigned long)no_addr; + + data.no_addr = no_addr; + data.skipped = 0; + data.non_block = non_block; + return iget5_locked(sb, hash, iget_test, iget_set, &data); +} + +/** + * gfs2_set_iop - Sets inode operations + * @inode: The inode with correct i_mode filled in + * + * GFS2 lookup code fills in vfs inode contents based on info obtained + * from directory entry inside gfs2_inode_lookup(). + */ + +static void gfs2_set_iop(struct inode *inode) +{ + struct gfs2_sbd *sdp = GFS2_SB(inode); + umode_t mode = inode->i_mode; + + if (S_ISREG(mode)) { + inode->i_op = &gfs2_file_iops; + if (gfs2_localflocks(sdp)) + inode->i_fop = &gfs2_file_fops_nolock; + else + inode->i_fop = &gfs2_file_fops; + } else if (S_ISDIR(mode)) { + inode->i_op = &gfs2_dir_iops; + if (gfs2_localflocks(sdp)) + inode->i_fop = &gfs2_dir_fops_nolock; + else + inode->i_fop = &gfs2_dir_fops; + } else if (S_ISLNK(mode)) { + inode->i_op = &gfs2_symlink_iops; + } else { + inode->i_op = &gfs2_file_iops; + init_special_inode(inode, inode->i_mode, inode->i_rdev); + } +} + +/** + * gfs2_inode_lookup - Lookup an inode + * @sb: The super block + * @no_addr: The inode number + * @type: The type of the inode + * non_block: Can we block on inodes that are being freed? + * + * Returns: A VFS inode, or an error + */ + +struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type, + u64 no_addr, u64 no_formal_ino, int non_block) +{ + struct inode *inode; + struct gfs2_inode *ip; + struct gfs2_glock *io_gl = NULL; + int error; + + inode = gfs2_iget(sb, no_addr, non_block); + ip = GFS2_I(inode); + + if (!inode) + return ERR_PTR(-ENOBUFS); + + if (inode->i_state & I_NEW) { + struct gfs2_sbd *sdp = GFS2_SB(inode); + ip->i_no_formal_ino = no_formal_ino; + + error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); + if (unlikely(error)) + goto fail; + ip->i_gl->gl_object = ip; + + error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); + if (unlikely(error)) + goto fail_put; + + set_bit(GIF_INVALID, &ip->i_flags); + error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); + if (unlikely(error)) + goto fail_iopen; + + ip->i_iopen_gh.gh_gl->gl_object = ip; + gfs2_glock_put(io_gl); + io_gl = NULL; + + if (type == DT_UNKNOWN) { + /* Inode glock must be locked already */ + error = gfs2_inode_refresh(GFS2_I(inode)); + if (error) + goto fail_refresh; + } else { + inode->i_mode = DT2IF(type); + } + + gfs2_set_iop(inode); + unlock_new_inode(inode); + } + + return inode; + +fail_refresh: + ip->i_iopen_gh.gh_gl->gl_object = NULL; + gfs2_glock_dq_uninit(&ip->i_iopen_gh); +fail_iopen: + if (io_gl) + gfs2_glock_put(io_gl); +fail_put: + ip->i_gl->gl_object = NULL; + gfs2_glock_put(ip->i_gl); +fail: + iget_failed(inode); + return ERR_PTR(error); +} + +struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr, + u64 *no_formal_ino, unsigned int blktype) +{ + struct super_block *sb = sdp->sd_vfs; + struct gfs2_holder i_gh; + struct inode *inode = NULL; + int error; + + /* Must not read in block until block type is verified */ + error = gfs2_glock_nq_num(sdp, no_addr, &gfs2_inode_glops, + LM_ST_EXCLUSIVE, GL_SKIP, &i_gh); + if (error) + return ERR_PTR(error); + + error = gfs2_check_blk_type(sdp, no_addr, blktype); + if (error) + goto fail; + + inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, 0, 1); + if (IS_ERR(inode)) + goto fail; + + /* Two extra checks for NFS only */ + if (no_formal_ino) { + error = -ESTALE; + if (GFS2_I(inode)->i_no_formal_ino != *no_formal_ino) + goto fail_iput; + + error = -EIO; + if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM) + goto fail_iput; + + error = 0; + } + +fail: + gfs2_glock_dq_uninit(&i_gh); + return error ? ERR_PTR(error) : inode; +fail_iput: + iput(inode); + goto fail; +} + + +struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) +{ + struct qstr qstr; + struct inode *inode; + gfs2_str2qstr(&qstr, name); + inode = gfs2_lookupi(dip, &qstr, 1); + /* gfs2_lookupi has inconsistent callers: vfs + * related routines expect NULL for no entry found, + * gfs2_lookup_simple callers expect ENOENT + * and do not check for NULL. + */ + if (inode == NULL) + return ERR_PTR(-ENOENT); + else + return inode; +} + + +/** + * gfs2_lookupi - Look up a filename in a directory and return its inode + * @d_gh: An initialized holder for the directory glock + * @name: The name of the inode to look for + * @is_root: If 1, ignore the caller's permissions + * @i_gh: An uninitialized holder for the new inode glock + * + * This can be called via the VFS filldir function when NFS is doing + * a readdirplus and the inode which its intending to stat isn't + * already in cache. In this case we must not take the directory glock + * again, since the readdir call will have already taken that lock. + * + * Returns: errno + */ + +struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, + int is_root) +{ + struct super_block *sb = dir->i_sb; + struct gfs2_inode *dip = GFS2_I(dir); + struct gfs2_holder d_gh; + int error = 0; + struct inode *inode = NULL; + int unlock = 0; + + if (!name->len || name->len > GFS2_FNAMESIZE) + return ERR_PTR(-ENAMETOOLONG); + + if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || + (name->len == 2 && memcmp(name->name, "..", 2) == 0 && + dir == sb->s_root->d_inode)) { + igrab(dir); + return dir; + } + + if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { + error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); + if (error) + return ERR_PTR(error); + unlock = 1; + } + + if (!is_root) { + error = gfs2_permission(dir, MAY_EXEC, 0); + if (error) + goto out; + } + + inode = gfs2_dir_search(dir, name); + if (IS_ERR(inode)) + error = PTR_ERR(inode); +out: + if (unlock) + gfs2_glock_dq_uninit(&d_gh); + if (error == -ENOENT) + return NULL; + return inode ? inode : ERR_PTR(error); +} + +/** + * create_ok - OK to create a new on-disk inode here? + * @dip: Directory in which dinode is to be created + * @name: Name of new dinode + * @mode: + * + * Returns: errno + */ + +static int create_ok(struct gfs2_inode *dip, const struct qstr *name, + unsigned int mode) +{ + int error; + + error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0); + if (error) + return error; + + /* Don't create entries in an unlinked directory */ + if (!dip->i_inode.i_nlink) + return -ENOENT; + + error = gfs2_dir_check(&dip->i_inode, name, NULL); + switch (error) { + case -ENOENT: + error = 0; + break; + case 0: + return -EEXIST; + default: + return error; + } + + if (dip->i_entries == (u32)-1) + return -EFBIG; + if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) + return -EMLINK; + + return 0; +} + +static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, + unsigned int *uid, unsigned int *gid) +{ + if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && + (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { + if (S_ISDIR(*mode)) + *mode |= S_ISUID; + else if (dip->i_inode.i_uid != current_fsuid()) + *mode &= ~07111; + *uid = dip->i_inode.i_uid; + } else + *uid = current_fsuid(); + + if (dip->i_inode.i_mode & S_ISGID) { + if (S_ISDIR(*mode)) + *mode |= S_ISGID; + *gid = dip->i_inode.i_gid; + } else + *gid = current_fsgid(); +} + +static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation) +{ + struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); + int error; + + if (gfs2_alloc_get(dip) == NULL) + return -ENOMEM; + + dip->i_alloc->al_requested = RES_DINODE; + error = gfs2_inplace_reserve(dip); + if (error) + goto out; + + error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); + if (error) + goto out_ipreserv; + + error = gfs2_alloc_di(dip, no_addr, generation); + + gfs2_trans_end(sdp); + +out_ipreserv: + gfs2_inplace_release(dip); +out: + gfs2_alloc_put(dip); + return error; +} + +/** + * init_dinode - Fill in a new dinode structure + * @dip: the directory this inode is being created in + * @gl: The glock covering the new inode + * @inum: the inode number + * @mode: the file permissions + * @uid: + * @gid: + * + */ + +static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, + const struct gfs2_inum_host *inum, unsigned int mode, + unsigned int uid, unsigned int gid, + const u64 *generation, dev_t dev, struct buffer_head **bhp) +{ + struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); + struct gfs2_dinode *di; + struct buffer_head *dibh; + struct timespec tv = CURRENT_TIME; + + dibh = gfs2_meta_new(gl, inum->no_addr); + gfs2_trans_add_bh(gl, dibh, 1); + gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); + gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); + di = (struct gfs2_dinode *)dibh->b_data; + + di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); + di->di_num.no_addr = cpu_to_be64(inum->no_addr); + di->di_mode = cpu_to_be32(mode); + di->di_uid = cpu_to_be32(uid); + di->di_gid = cpu_to_be32(gid); + di->di_nlink = 0; + di->di_size = 0; + di->di_blocks = cpu_to_be64(1); + di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec); + di->di_major = cpu_to_be32(MAJOR(dev)); + di->di_minor = cpu_to_be32(MINOR(dev)); + di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); + di->di_generation = cpu_to_be64(*generation); + di->di_flags = 0; + + if (S_ISREG(mode)) { + if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || + gfs2_tune_get(sdp, gt_new_files_jdata)) + di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); + } else if (S_ISDIR(mode)) { + di->di_flags |= cpu_to_be32(dip->i_diskflags & + GFS2_DIF_INHERIT_JDATA); + } + + di->__pad1 = 0; + di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); + di->di_height = 0; + di->__pad2 = 0; + di->__pad3 = 0; + di->di_depth = 0; + di->di_entries = 0; + memset(&di->__pad4, 0, sizeof(di->__pad4)); + di->di_eattr = 0; + di->di_atime_nsec = cpu_to_be32(tv.tv_nsec); + di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec); + di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec); + memset(&di->di_reserved, 0, sizeof(di->di_reserved)); + + set_buffer_uptodate(dibh); + + *bhp = dibh; +} + +static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, + unsigned int mode, const struct gfs2_inum_host *inum, + const u64 *generation, dev_t dev, struct buffer_head **bhp) +{ + struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); + unsigned int uid, gid; + int error; + + munge_mode_uid_gid(dip, &mode, &uid, &gid); + if (!gfs2_alloc_get(dip)) + return -ENOMEM; + + error = gfs2_quota_lock(dip, uid, gid); + if (error) + goto out; + + error = gfs2_quota_check(dip, uid, gid); + if (error) + goto out_quota; + + error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); + if (error) + goto out_quota; + + init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp); + gfs2_quota_change(dip, +1, uid, gid); + gfs2_trans_end(sdp); + +out_quota: + gfs2_quota_unlock(dip); +out: + gfs2_alloc_put(dip); + return error; +} + +static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, + struct gfs2_inode *ip) +{ + struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); + struct gfs2_alloc *al; + int alloc_required; + struct buffer_head *dibh; + int error; + + al = gfs2_alloc_get(dip); + if (!al) + return -ENOMEM; + + error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); + if (error) + goto fail; + + error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); + if (alloc_required < 0) + goto fail_quota_locks; + if (alloc_required) { + error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); + if (error) + goto fail_quota_locks; + + al->al_requested = sdp->sd_max_dirres; + + error = gfs2_inplace_reserve(dip); + if (error) + goto fail_quota_locks; + + error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + + al->al_rgd->rd_length + + 2 * RES_DINODE + + RES_STATFS + RES_QUOTA, 0); + if (error) + goto fail_ipreserv; + } else { + error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); + if (error) + goto fail_quota_locks; + } + + error = gfs2_dir_add(&dip->i_inode, name, ip); + if (error) + goto fail_end_trans; + + error = gfs2_meta_inode_buffer(ip, &dibh); + if (error) + goto fail_end_trans; + ip->i_inode.i_nlink = 1; + gfs2_trans_add_bh(ip->i_gl, dibh, 1); + gfs2_dinode_out(ip, dibh->b_data); + brelse(dibh); + return 0; + +fail_end_trans: + gfs2_trans_end(sdp); + +fail_ipreserv: + if (dip->i_alloc->al_rgd) + gfs2_inplace_release(dip); + +fail_quota_locks: + gfs2_quota_unlock(dip); + +fail: + gfs2_alloc_put(dip); + return error; +} + +static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip, + const struct qstr *qstr) +{ + int err; + size_t len; + void *value; + char *name; + + err = security_inode_init_security(&ip->i_inode, &dip->i_inode, qstr, + &name, &value, &len); + + if (err) { + if (err == -EOPNOTSUPP) + return 0; + return err; + } + + err = __gfs2_xattr_set(&ip->i_inode, name, value, len, 0, + GFS2_EATYPE_SECURITY); + kfree(value); + kfree(name); + + return err; +} + +/** + * gfs2_createi - Create a new inode + * @ghs: An array of two holders + * @name: The name of the new file + * @mode: the permissions on the new inode + * + * @ghs[0] is an initialized holder for the directory + * @ghs[1] is the holder for the inode lock + * + * If the return value is not NULL, the glocks on both the directory and the new + * file are held. A transaction has been started and an inplace reservation + * is held, as well. + * + * Returns: An inode + */ + +struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, + unsigned int mode, dev_t dev) +{ + struct inode *inode = NULL; + struct gfs2_inode *dip = ghs->gh_gl->gl_object; + struct inode *dir = &dip->i_inode; + struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); + struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 }; + int error; + u64 generation; + struct buffer_head *bh = NULL; + + if (!name->len || name->len > GFS2_FNAMESIZE) + return ERR_PTR(-ENAMETOOLONG); + + gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); + error = gfs2_glock_nq(ghs); + if (error) + goto fail; + + error = create_ok(dip, name, mode); + if (error) + goto fail_gunlock; + + error = alloc_dinode(dip, &inum.no_addr, &generation); + if (error) + goto fail_gunlock; + inum.no_formal_ino = generation; + + error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, + LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); + if (error) + goto fail_gunlock; + + error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, &bh); + if (error) + goto fail_gunlock2; + + inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), inum.no_addr, + inum.no_formal_ino, 0); + if (IS_ERR(inode)) + goto fail_gunlock2; + + error = gfs2_inode_refresh(GFS2_I(inode)); + if (error) + goto fail_gunlock2; + + error = gfs2_acl_create(dip, inode); + if (error) + goto fail_gunlock2; + + error = gfs2_security_init(dip, GFS2_I(inode), name); + if (error) + goto fail_gunlock2; + + error = link_dinode(dip, name, GFS2_I(inode)); + if (error) + goto fail_gunlock2; + + if (bh) + brelse(bh); + return inode; + +fail_gunlock2: + gfs2_glock_dq_uninit(ghs + 1); + if (inode && !IS_ERR(inode)) + iput(inode); +fail_gunlock: + gfs2_glock_dq(ghs); +fail: + if (bh) + brelse(bh); + return ERR_PTR(error); +} +/** + * gfs2_create - Create a file + * @dir: The directory in which to create the file + * @dentry: The dentry of the new file + * @mode: The mode of the new file + * + * Returns: errno + */ + +static int gfs2_create(struct inode *dir, struct dentry *dentry, + int mode, struct nameidata *nd) +{ + struct gfs2_inode *dip = GFS2_I(dir); + struct gfs2_sbd *sdp = GFS2_SB(dir); + struct gfs2_holder ghs[2]; + struct inode *inode; + + gfs2_holder_init(dip->i_gl, 0, 0, ghs); + + for (;;) { + inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0); + if (!IS_ERR(inode)) { + gfs2_trans_end(sdp); + if (dip->i_alloc->al_rgd) + gfs2_inplace_release(dip); + gfs2_quota_unlock(dip); + gfs2_alloc_put(dip); + gfs2_glock_dq_uninit_m(2, ghs); + mark_inode_dirty(inode); + break; + } else if (PTR_ERR(inode) != -EEXIST || + (nd && nd->flags & LOOKUP_EXCL)) { + gfs2_holder_uninit(ghs); + return PTR_ERR(inode); + } + + inode = gfs2_lookupi(dir, &dentry->d_name, 0); + if (inode) { + if (!IS_ERR(inode)) { + gfs2_holder_uninit(ghs); + break; + } else { + gfs2_holder_uninit(ghs); + return PTR_ERR(inode); + } + } + } + + d_instantiate(dentry, inode); + + return 0; +} + +/** + * gfs2_lookup - Look up a filename in a directory and return its inode + * @dir: The directory inode + * @dentry: The dentry of the new inode + * @nd: passed from Linux VFS, ignored by us + * + * Called by the VFS layer. Lock dir and call gfs2_lookupi() + * + * Returns: errno + */ + +static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry, + struct nameidata *nd) +{ + struct inode *inode = NULL; + + inode = gfs2_lookupi(dir, &dentry->d_name, 0); + if (inode && IS_ERR(inode)) + return ERR_CAST(inode); + + if (inode) { + struct gfs2_glock *gl = GFS2_I(inode)->i_gl; + struct gfs2_holder gh; + int error; + error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); + if (error) { + iput(inode); + return ERR_PTR(error); + } + gfs2_glock_dq_uninit(&gh); + return d_splice_alias(inode, dentry); + } + d_add(dentry, inode); + + return NULL; +} + +/** + * gfs2_link - Link to a file + * @old_dentry: The inode to link + * @dir: Add link to this directory + * @dentry: The name of the link + * + * Link the inode in "old_dentry" into the directory "dir" with the + * name in "dentry". + * + * Returns: errno + */ + +static int gfs2_link(struct dentry *old_dentry, struct inode *dir, + struct dentry *dentry) +{ + struct gfs2_inode *dip = GFS2_I(dir); + struct gfs2_sbd *sdp = GFS2_SB(dir); + struct inode *inode = old_dentry->d_inode; + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder ghs[2]; + struct buffer_head *dibh; + int alloc_required; + int error; + + if (S_ISDIR(inode->i_mode)) + return -EPERM; + + gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); + gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); + + error = gfs2_glock_nq(ghs); /* parent */ + if (error) + goto out_parent; + + error = gfs2_glock_nq(ghs + 1); /* child */ + if (error) + goto out_child; + + error = -ENOENT; + if (inode->i_nlink == 0) + goto out_gunlock; + + error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC, 0); + if (error) + goto out_gunlock; + + error = gfs2_dir_check(dir, &dentry->d_name, NULL); + switch (error) { + case -ENOENT: + break; + case 0: + error = -EEXIST; + default: + goto out_gunlock; + } + + error = -EINVAL; + if (!dip->i_inode.i_nlink) + goto out_gunlock; + error = -EFBIG; + if (dip->i_entries == (u32)-1) + goto out_gunlock; + error = -EPERM; + if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) + goto out_gunlock; + error = -EINVAL; + if (!ip->i_inode.i_nlink) + goto out_gunlock; + error = -EMLINK; + if (ip->i_inode.i_nlink == (u32)-1) + goto out_gunlock; + + alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); + if (error < 0) + goto out_gunlock; + error = 0; + + if (alloc_required) { + struct gfs2_alloc *al = gfs2_alloc_get(dip); + if (!al) { + error = -ENOMEM; + goto out_gunlock; + } + + error = gfs2_quota_lock_check(dip); + if (error) + goto out_alloc; + + al->al_requested = sdp->sd_max_dirres; + + error = gfs2_inplace_reserve(dip); + if (error) + goto out_gunlock_q; + + error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + + gfs2_rg_blocks(al) + + 2 * RES_DINODE + RES_STATFS + + RES_QUOTA, 0); + if (error) + goto out_ipres; + } else { + error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); + if (error) + goto out_ipres; + } + + error = gfs2_meta_inode_buffer(ip, &dibh); + if (error) + goto out_end_trans; + + error = gfs2_dir_add(dir, &dentry->d_name, ip); + if (error) + goto out_brelse; + + gfs2_trans_add_bh(ip->i_gl, dibh, 1); + inc_nlink(&ip->i_inode); + ip->i_inode.i_ctime = CURRENT_TIME; + gfs2_dinode_out(ip, dibh->b_data); + mark_inode_dirty(&ip->i_inode); + +out_brelse: + brelse(dibh); +out_end_trans: + gfs2_trans_end(sdp); +out_ipres: + if (alloc_required) + gfs2_inplace_release(dip); +out_gunlock_q: + if (alloc_required) + gfs2_quota_unlock(dip); +out_alloc: + if (alloc_required) + gfs2_alloc_put(dip); +out_gunlock: + gfs2_glock_dq(ghs + 1); +out_child: + gfs2_glock_dq(ghs); +out_parent: + gfs2_holder_uninit(ghs); + gfs2_holder_uninit(ghs + 1); + if (!error) { + ihold(inode); + d_instantiate(dentry, inode); + mark_inode_dirty(inode); + } + return error; +} + +/* + * gfs2_unlink_ok - check to see that a inode is still in a directory + * @dip: the directory + * @name: the name of the file + * @ip: the inode + * + * Assumes that the lock on (at least) @dip is held. + * + * Returns: 0 if the parent/child relationship is correct, errno if it isn't + */ + +static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, + const struct gfs2_inode *ip) +{ + int error; + + if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) + return -EPERM; + + if ((dip->i_inode.i_mode & S_ISVTX) && + dip->i_inode.i_uid != current_fsuid() && + ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER)) + return -EPERM; + + if (IS_APPEND(&dip->i_inode)) + return -EPERM; + + error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0); + if (error) + return error; + + error = gfs2_dir_check(&dip->i_inode, name, ip); + if (error) + return error; + + return 0; +} + +/** + * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it + * @dip: The parent directory + * @name: The name of the entry in the parent directory + * @bh: The inode buffer for the inode to be removed + * @inode: The inode to be removed + * + * Called with all the locks and in a transaction. This will only be + * called for a directory after it has been checked to ensure it is empty. + * + * Returns: 0 on success, or an error + */ + +static int gfs2_unlink_inode(struct gfs2_inode *dip, + const struct dentry *dentry, + struct buffer_head *bh) +{ + struct inode *inode = dentry->d_inode; + struct gfs2_inode *ip = GFS2_I(inode); + int error; + + error = gfs2_dir_del(dip, dentry); + if (error) + return error; + + ip->i_entries = 0; + inode->i_ctime = CURRENT_TIME; + if (S_ISDIR(inode->i_mode)) + clear_nlink(inode); + else + drop_nlink(inode); + gfs2_trans_add_bh(ip->i_gl, bh, 1); + gfs2_dinode_out(ip, bh->b_data); + mark_inode_dirty(inode); + if (inode->i_nlink == 0) + gfs2_unlink_di(inode); + return 0; +} + + +/** + * gfs2_unlink - Unlink an inode (this does rmdir as well) + * @dir: The inode of the directory containing the inode to unlink + * @dentry: The file itself + * + * This routine uses the type of the inode as a flag to figure out + * whether this is an unlink or an rmdir. + * + * Returns: errno + */ + +static int gfs2_unlink(struct inode *dir, struct dentry *dentry) +{ + struct gfs2_inode *dip = GFS2_I(dir); + struct gfs2_sbd *sdp = GFS2_SB(dir); + struct inode *inode = dentry->d_inode; + struct gfs2_inode *ip = GFS2_I(inode); + struct buffer_head *bh; + struct gfs2_holder ghs[3]; + struct gfs2_rgrpd *rgd; + struct gfs2_holder ri_gh; + int error; + + error = gfs2_rindex_hold(sdp, &ri_gh); + if (error) + return error; + + gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); + gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); + + rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); + gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2); + + + error = gfs2_glock_nq(ghs); /* parent */ + if (error) + goto out_parent; + + error = gfs2_glock_nq(ghs + 1); /* child */ + if (error) + goto out_child; + + error = -ENOENT; + if (inode->i_nlink == 0) + goto out_rgrp; + + if (S_ISDIR(inode->i_mode)) { + error = -ENOTEMPTY; + if (ip->i_entries > 2 || inode->i_nlink > 2) + goto out_rgrp; + } + + error = gfs2_glock_nq(ghs + 2); /* rgrp */ + if (error) + goto out_rgrp; + + error = gfs2_unlink_ok(dip, &dentry->d_name, ip); + if (error) + goto out_gunlock; + + error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0); + if (error) + goto out_gunlock; + + error = gfs2_meta_inode_buffer(ip, &bh); + if (error) + goto out_end_trans; + + error = gfs2_unlink_inode(dip, dentry, bh); + brelse(bh); + +out_end_trans: + gfs2_trans_end(sdp); +out_gunlock: + gfs2_glock_dq(ghs + 2); +out_rgrp: + gfs2_holder_uninit(ghs + 2); + gfs2_glock_dq(ghs + 1); +out_child: + gfs2_holder_uninit(ghs + 1); + gfs2_glock_dq(ghs); +out_parent: + gfs2_holder_uninit(ghs); + gfs2_glock_dq_uninit(&ri_gh); + return error; +} + +/** + * gfs2_symlink - Create a symlink + * @dir: The directory to create the symlink in + * @dentry: The dentry to put the symlink in + * @symname: The thing which the link points to + * + * Returns: errno + */ + +static int gfs2_symlink(struct inode *dir, struct dentry *dentry, + const char *symname) +{ + struct gfs2_inode *dip = GFS2_I(dir), *ip; + struct gfs2_sbd *sdp = GFS2_SB(dir); + struct gfs2_holder ghs[2]; + struct inode *inode; + struct buffer_head *dibh; + int size; + int error; + + /* Must be stuffed with a null terminator for gfs2_follow_link() */ + size = strlen(symname); + if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) + return -ENAMETOOLONG; + + gfs2_holder_init(dip->i_gl, 0, 0, ghs); + + inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0); + if (IS_ERR(inode)) { + gfs2_holder_uninit(ghs); + return PTR_ERR(inode); + } + + ip = ghs[1].gh_gl->gl_object; + + i_size_write(inode, size); + + error = gfs2_meta_inode_buffer(ip, &dibh); + + if (!gfs2_assert_withdraw(sdp, !error)) { + gfs2_dinode_out(ip, dibh->b_data); + memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, + size); + brelse(dibh); + } + + gfs2_trans_end(sdp); + if (dip->i_alloc->al_rgd) + gfs2_inplace_release(dip); + gfs2_quota_unlock(dip); + gfs2_alloc_put(dip); + + gfs2_glock_dq_uninit_m(2, ghs); + + d_instantiate(dentry, inode); + mark_inode_dirty(inode); + + return 0; +} + +/** + * gfs2_mkdir - Make a directory + * @dir: The parent directory of the new one + * @dentry: The dentry of the new directory + * @mode: The mode of the new directory + * + * Returns: errno + */ + +static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode) +{ + struct gfs2_inode *dip = GFS2_I(dir), *ip; + struct gfs2_sbd *sdp = GFS2_SB(dir); + struct gfs2_holder ghs[2]; + struct inode *inode; + struct buffer_head *dibh; + int error; + + gfs2_holder_init(dip->i_gl, 0, 0, ghs); + + inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0); + if (IS_ERR(inode)) { + gfs2_holder_uninit(ghs); + return PTR_ERR(inode); + } + + ip = ghs[1].gh_gl->gl_object; + + ip->i_inode.i_nlink = 2; + i_size_write(inode, sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)); + ip->i_diskflags |= GFS2_DIF_JDATA; + ip->i_entries = 2; + + error = gfs2_meta_inode_buffer(ip, &dibh); + + if (!gfs2_assert_withdraw(sdp, !error)) { + struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; + struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1); + + gfs2_trans_add_bh(ip->i_gl, dibh, 1); + gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent); + dent->de_inum = di->di_num; /* already GFS2 endian */ + dent->de_type = cpu_to_be16(DT_DIR); + di->di_entries = cpu_to_be32(1); + + dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1)); + gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent); + + gfs2_inum_out(dip, dent); + dent->de_type = cpu_to_be16(DT_DIR); + + gfs2_dinode_out(ip, di); + + brelse(dibh); + } + + gfs2_trans_end(sdp); + if (dip->i_alloc->al_rgd) + gfs2_inplace_release(dip); + gfs2_quota_unlock(dip); + gfs2_alloc_put(dip); + + gfs2_glock_dq_uninit_m(2, ghs); + + d_instantiate(dentry, inode); + mark_inode_dirty(inode); + + return 0; +} + +/** + * gfs2_mknod - Make a special file + * @dir: The directory in which the special file will reside + * @dentry: The dentry of the special file + * @mode: The mode of the special file + * @rdev: The device specification of the special file + * + */ + +static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode, + dev_t dev) +{ + struct gfs2_inode *dip = GFS2_I(dir); + struct gfs2_sbd *sdp = GFS2_SB(dir); + struct gfs2_holder ghs[2]; + struct inode *inode; + + gfs2_holder_init(dip->i_gl, 0, 0, ghs); + + inode = gfs2_createi(ghs, &dentry->d_name, mode, dev); + if (IS_ERR(inode)) { + gfs2_holder_uninit(ghs); + return PTR_ERR(inode); + } + + gfs2_trans_end(sdp); + if (dip->i_alloc->al_rgd) + gfs2_inplace_release(dip); + gfs2_quota_unlock(dip); + gfs2_alloc_put(dip); + + gfs2_glock_dq_uninit_m(2, ghs); + + d_instantiate(dentry, inode); + mark_inode_dirty(inode); + + return 0; +} + +/* + * gfs2_ok_to_move - check if it's ok to move a directory to another directory + * @this: move this + * @to: to here + * + * Follow @to back to the root and make sure we don't encounter @this + * Assumes we already hold the rename lock. + * + * Returns: errno + */ + +static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to) +{ + struct inode *dir = &to->i_inode; + struct super_block *sb = dir->i_sb; + struct inode *tmp; + int error = 0; + + igrab(dir); + + for (;;) { + if (dir == &this->i_inode) { + error = -EINVAL; + break; + } + if (dir == sb->s_root->d_inode) { + error = 0; + break; + } + + tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1); + if (IS_ERR(tmp)) { + error = PTR_ERR(tmp); + break; + } + + iput(dir); + dir = tmp; + } + + iput(dir); + + return error; +} + +/** + * gfs2_rename - Rename a file + * @odir: Parent directory of old file name + * @odentry: The old dentry of the file + * @ndir: Parent directory of new file name + * @ndentry: The new dentry of the file + * + * Returns: errno + */ + +static int gfs2_rename(struct inode *odir, struct dentry *odentry, + struct inode *ndir, struct dentry *ndentry) +{ + struct gfs2_inode *odip = GFS2_I(odir); + struct gfs2_inode *ndip = GFS2_I(ndir); + struct gfs2_inode *ip = GFS2_I(odentry->d_inode); + struct gfs2_inode *nip = NULL; + struct gfs2_sbd *sdp = GFS2_SB(odir); + struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh; + struct gfs2_rgrpd *nrgd; + unsigned int num_gh; + int dir_rename = 0; + int alloc_required = 0; + unsigned int x; + int error; + + if (ndentry->d_inode) { + nip = GFS2_I(ndentry->d_inode); + if (ip == nip) + return 0; + } + + error = gfs2_rindex_hold(sdp, &ri_gh); + if (error) + return error; + + if (odip != ndip) { + error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, + 0, &r_gh); + if (error) + goto out; + + if (S_ISDIR(ip->i_inode.i_mode)) { + dir_rename = 1; + /* don't move a dirctory into it's subdir */ + error = gfs2_ok_to_move(ip, ndip); + if (error) + goto out_gunlock_r; + } + } + + num_gh = 1; + gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); + if (odip != ndip) { + gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); + num_gh++; + } + gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); + num_gh++; + + if (nip) { + gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); + num_gh++; + /* grab the resource lock for unlink flag twiddling + * this is the case of the target file already existing + * so we unlink before doing the rename + */ + nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr); + if (nrgd) + gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); + } + + for (x = 0; x < num_gh; x++) { + error = gfs2_glock_nq(ghs + x); + if (error) + goto out_gunlock; + } + + error = -ENOENT; + if (ip->i_inode.i_nlink == 0) + goto out_gunlock; + + /* Check out the old directory */ + + error = gfs2_unlink_ok(odip, &odentry->d_name, ip); + if (error) + goto out_gunlock; + + /* Check out the new directory */ + + if (nip) { + error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); + if (error) + goto out_gunlock; + + if (nip->i_inode.i_nlink == 0) { + error = -EAGAIN; + goto out_gunlock; + } + + if (S_ISDIR(nip->i_inode.i_mode)) { + if (nip->i_entries < 2) { + gfs2_consist_inode(nip); + error = -EIO; + goto out_gunlock; + } + if (nip->i_entries > 2) { + error = -ENOTEMPTY; + goto out_gunlock; + } + } + } else { + error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC, 0); + if (error) + goto out_gunlock; + + error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); + switch (error) { + case -ENOENT: + error = 0; + break; + case 0: + error = -EEXIST; + default: + goto out_gunlock; + }; + + if (odip != ndip) { + if (!ndip->i_inode.i_nlink) { + error = -ENOENT; + goto out_gunlock; + } + if (ndip->i_entries == (u32)-1) { + error = -EFBIG; + goto out_gunlock; + } + if (S_ISDIR(ip->i_inode.i_mode) && + ndip->i_inode.i_nlink == (u32)-1) { + error = -EMLINK; + goto out_gunlock; + } + } + } + + /* Check out the dir to be renamed */ + + if (dir_rename) { + error = gfs2_permission(odentry->d_inode, MAY_WRITE, 0); + if (error) + goto out_gunlock; + } + + if (nip == NULL) + alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); + error = alloc_required; + if (error < 0) + goto out_gunlock; + error = 0; + + if (alloc_required) { + struct gfs2_alloc *al = gfs2_alloc_get(ndip); + if (!al) { + error = -ENOMEM; + goto out_gunlock; + } + + error = gfs2_quota_lock_check(ndip); + if (error) + goto out_alloc; + + al->al_requested = sdp->sd_max_dirres; + + error = gfs2_inplace_reserve_ri(ndip); + if (error) + goto out_gunlock_q; + + error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + + gfs2_rg_blocks(al) + + 4 * RES_DINODE + 4 * RES_LEAF + + RES_STATFS + RES_QUOTA + 4, 0); + if (error) + goto out_ipreserv; + } else { + error = gfs2_trans_begin(sdp, 4 * RES_DINODE + + 5 * RES_LEAF + 4, 0); + if (error) + goto out_gunlock; + } + + /* Remove the target file, if it exists */ + + if (nip) { + struct buffer_head *bh; + error = gfs2_meta_inode_buffer(nip, &bh); + if (error) + goto out_end_trans; + error = gfs2_unlink_inode(ndip, ndentry, bh); + brelse(bh); + } + + if (dir_rename) { + error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR); + if (error) + goto out_end_trans; + } else { + struct buffer_head *dibh; + error = gfs2_meta_inode_buffer(ip, &dibh); + if (error) + goto out_end_trans; + ip->i_inode.i_ctime = CURRENT_TIME; + gfs2_trans_add_bh(ip->i_gl, dibh, 1); + gfs2_dinode_out(ip, dibh->b_data); + brelse(dibh); + } + + error = gfs2_dir_del(odip, odentry); + if (error) + goto out_end_trans; + + error = gfs2_dir_add(ndir, &ndentry->d_name, ip); + if (error) + goto out_end_trans; + +out_end_trans: + gfs2_trans_end(sdp); +out_ipreserv: + if (alloc_required) + gfs2_inplace_release(ndip); +out_gunlock_q: + if (alloc_required) + gfs2_quota_unlock(ndip); +out_alloc: + if (alloc_required) + gfs2_alloc_put(ndip); +out_gunlock: + while (x--) { + gfs2_glock_dq(ghs + x); + gfs2_holder_uninit(ghs + x); + } +out_gunlock_r: + if (r_gh.gh_gl) + gfs2_glock_dq_uninit(&r_gh); +out: + gfs2_glock_dq_uninit(&ri_gh); + return error; +} + +/** + * gfs2_follow_link - Follow a symbolic link + * @dentry: The dentry of the link + * @nd: Data that we pass to vfs_follow_link() + * + * This can handle symlinks of any size. + * + * Returns: 0 on success or error code + */ + +static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + struct gfs2_inode *ip = GFS2_I(dentry->d_inode); + struct gfs2_holder i_gh; + struct buffer_head *dibh; + unsigned int x, size; + char *buf; + int error; + + gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); + error = gfs2_glock_nq(&i_gh); + if (error) { + gfs2_holder_uninit(&i_gh); + nd_set_link(nd, ERR_PTR(error)); + return NULL; + } + + size = (unsigned int)i_size_read(&ip->i_inode); + if (size == 0) { + gfs2_consist_inode(ip); + buf = ERR_PTR(-EIO); + goto out; + } + + error = gfs2_meta_inode_buffer(ip, &dibh); + if (error) { + buf = ERR_PTR(error); + goto out; + } + + x = size + 1; + buf = kmalloc(x, GFP_NOFS); + if (!buf) + buf = ERR_PTR(-ENOMEM); + else + memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), x); + brelse(dibh); +out: + gfs2_glock_dq_uninit(&i_gh); + nd_set_link(nd, buf); + return NULL; +} + +static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p) +{ + char *s = nd_get_link(nd); + if (!IS_ERR(s)) + kfree(s); +} + +/** + * gfs2_permission - + * @inode: The inode + * @mask: The mask to be tested + * @flags: Indicates whether this is an RCU path walk or not + * + * This may be called from the VFS directly, or from within GFS2 with the + * inode locked, so we look to see if the glock is already locked and only + * lock the glock if its not already been done. + * + * Returns: errno + */ + +int gfs2_permission(struct inode *inode, int mask, unsigned int flags) +{ + struct gfs2_inode *ip; + struct gfs2_holder i_gh; + int error; + int unlock = 0; + + + ip = GFS2_I(inode); + if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { + if (flags & IPERM_FLAG_RCU) + return -ECHILD; + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); + if (error) + return error; + unlock = 1; + } + + if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode)) + error = -EACCES; + else + error = generic_permission(inode, mask, flags, gfs2_check_acl); + if (unlock) + gfs2_glock_dq_uninit(&i_gh); + + return error; +} + +static int __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) +{ + struct inode *inode = &ip->i_inode; + struct buffer_head *dibh; + int error; + + error = gfs2_meta_inode_buffer(ip, &dibh); + if (error) + return error; + + setattr_copy(inode, attr); + mark_inode_dirty(inode); + gfs2_trans_add_bh(ip->i_gl, dibh, 1); + gfs2_dinode_out(ip, dibh->b_data); + brelse(dibh); + return 0; +} + +/** + * gfs2_setattr_simple - + * @ip: + * @attr: + * + * Returns: errno + */ + +int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) +{ + int error; + + if (current->journal_info) + return __gfs2_setattr_simple(ip, attr); + + error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); + if (error) + return error; + + error = __gfs2_setattr_simple(ip, attr); + gfs2_trans_end(GFS2_SB(&ip->i_inode)); + return error; +} + +static int setattr_chown(struct inode *inode, struct iattr *attr) +{ + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_sbd *sdp = GFS2_SB(inode); + u32 ouid, ogid, nuid, ngid; + int error; + + ouid = inode->i_uid; + ogid = inode->i_gid; + nuid = attr->ia_uid; + ngid = attr->ia_gid; + + if (!(attr->ia_valid & ATTR_UID) || ouid == nuid) + ouid = nuid = NO_QUOTA_CHANGE; + if (!(attr->ia_valid & ATTR_GID) || ogid == ngid) + ogid = ngid = NO_QUOTA_CHANGE; + + if (!gfs2_alloc_get(ip)) + return -ENOMEM; + + error = gfs2_quota_lock(ip, nuid, ngid); + if (error) + goto out_alloc; + + if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { + error = gfs2_quota_check(ip, nuid, ngid); + if (error) + goto out_gunlock_q; + } + + error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); + if (error) + goto out_gunlock_q; + + error = gfs2_setattr_simple(ip, attr); + if (error) + goto out_end_trans; + + if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { + u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); + gfs2_quota_change(ip, -blocks, ouid, ogid); + gfs2_quota_change(ip, blocks, nuid, ngid); + } + +out_end_trans: + gfs2_trans_end(sdp); +out_gunlock_q: + gfs2_quota_unlock(ip); +out_alloc: + gfs2_alloc_put(ip); + return error; +} + +/** + * gfs2_setattr - Change attributes on an inode + * @dentry: The dentry which is changing + * @attr: The structure describing the change + * + * The VFS layer wants to change one or more of an inodes attributes. Write + * that change out to disk. + * + * Returns: errno + */ + +static int gfs2_setattr(struct dentry *dentry, struct iattr *attr) +{ + struct inode *inode = dentry->d_inode; + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder i_gh; + int error; + + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); + if (error) + return error; + + error = -EPERM; + if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) + goto out; + + error = inode_change_ok(inode, attr); + if (error) + goto out; + + if (attr->ia_valid & ATTR_SIZE) + error = gfs2_setattr_size(inode, attr->ia_size); + else if (attr->ia_valid & (ATTR_UID | ATTR_GID)) + error = setattr_chown(inode, attr); + else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode)) + error = gfs2_acl_chmod(ip, attr); + else + error = gfs2_setattr_simple(ip, attr); + +out: + gfs2_glock_dq_uninit(&i_gh); + if (!error) + mark_inode_dirty(inode); + return error; +} + +/** + * gfs2_getattr - Read out an inode's attributes + * @mnt: The vfsmount the inode is being accessed from + * @dentry: The dentry to stat + * @stat: The inode's stats + * + * This may be called from the VFS directly, or from within GFS2 with the + * inode locked, so we look to see if the glock is already locked and only + * lock the glock if its not already been done. Note that its the NFS + * readdirplus operation which causes this to be called (from filldir) + * with the glock already held. + * + * Returns: errno + */ + +static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry, + struct kstat *stat) +{ + struct inode *inode = dentry->d_inode; + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder gh; + int error; + int unlock = 0; + + if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) { + error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); + if (error) + return error; + unlock = 1; + } + + generic_fillattr(inode, stat); + if (unlock) + gfs2_glock_dq_uninit(&gh); + + return 0; +} + +static int gfs2_setxattr(struct dentry *dentry, const char *name, + const void *data, size_t size, int flags) +{ + struct inode *inode = dentry->d_inode; + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder gh; + int ret; + + gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); + ret = gfs2_glock_nq(&gh); + if (ret == 0) { + ret = generic_setxattr(dentry, name, data, size, flags); + gfs2_glock_dq(&gh); + } + gfs2_holder_uninit(&gh); + return ret; +} + +static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name, + void *data, size_t size) +{ + struct inode *inode = dentry->d_inode; + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder gh; + int ret; + + gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh); + ret = gfs2_glock_nq(&gh); + if (ret == 0) { + ret = generic_getxattr(dentry, name, data, size); + gfs2_glock_dq(&gh); + } + gfs2_holder_uninit(&gh); + return ret; +} + +static int gfs2_removexattr(struct dentry *dentry, const char *name) +{ + struct inode *inode = dentry->d_inode; + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder gh; + int ret; + + gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); + ret = gfs2_glock_nq(&gh); + if (ret == 0) { + ret = generic_removexattr(dentry, name); + gfs2_glock_dq(&gh); + } + gfs2_holder_uninit(&gh); + return ret; +} + +static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, + u64 start, u64 len) +{ + struct gfs2_inode *ip = GFS2_I(inode); + struct gfs2_holder gh; + int ret; + + ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); + if (ret) + return ret; + + mutex_lock(&inode->i_mutex); + + ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh); + if (ret) + goto out; + + if (gfs2_is_stuffed(ip)) { + u64 phys = ip->i_no_addr << inode->i_blkbits; + u64 size = i_size_read(inode); + u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED| + FIEMAP_EXTENT_DATA_INLINE; + phys += sizeof(struct gfs2_dinode); + phys += start; + if (start + len > size) + len = size - start; + if (start < size) + ret = fiemap_fill_next_extent(fieinfo, start, phys, + len, flags); + if (ret == 1) + ret = 0; + } else { + ret = __generic_block_fiemap(inode, fieinfo, start, len, + gfs2_block_map); + } + + gfs2_glock_dq_uninit(&gh); +out: + mutex_unlock(&inode->i_mutex); + return ret; +} + +const struct inode_operations gfs2_file_iops = { + .permission = gfs2_permission, + .setattr = gfs2_setattr, + .getattr = gfs2_getattr, + .setxattr = gfs2_setxattr, + .getxattr = gfs2_getxattr, + .listxattr = gfs2_listxattr, + .removexattr = gfs2_removexattr, + .fiemap = gfs2_fiemap, +}; + +const struct inode_operations gfs2_dir_iops = { + .create = gfs2_create, + .lookup = gfs2_lookup, + .link = gfs2_link, + .unlink = gfs2_unlink, + .symlink = gfs2_symlink, + .mkdir = gfs2_mkdir, + .rmdir = gfs2_unlink, + .mknod = gfs2_mknod, + .rename = gfs2_rename, + .permission = gfs2_permission, + .setattr = gfs2_setattr, + .getattr = gfs2_getattr, + .setxattr = gfs2_setxattr, + .getxattr = gfs2_getxattr, + .listxattr = gfs2_listxattr, + .removexattr = gfs2_removexattr, + .fiemap = gfs2_fiemap, +}; + +const struct inode_operations gfs2_symlink_iops = { + .readlink = generic_readlink, + .follow_link = gfs2_follow_link, + .put_link = gfs2_put_link, + .permission = gfs2_permission, + .setattr = gfs2_setattr, + .getattr = gfs2_getattr, + .setxattr = gfs2_setxattr, + .getxattr = gfs2_getxattr, + .listxattr = gfs2_listxattr, + .removexattr = gfs2_removexattr, + .fiemap = gfs2_fiemap, +}; + |