/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. * Copyright (C) 2004-2011 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; } static void gfs2_init_dir(struct buffer_head *dibh, const struct gfs2_inode *parent) { struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data; struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+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); 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(parent, dent); dent->de_type = cpu_to_be16(DT_DIR); } /** * 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: The uid of the new inode * @gid: The gid of the new inode * @generation: The generation number of the new inode * @dev: The device number (if a device node) * @symname: The symlink destination (if a symlink) * @size: The inode size (ignored for directories) * @bhp: The buffer head (returned to caller) * */ 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, const char *symname, unsigned size, 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 = cpu_to_be64(size); 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; 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)); switch(mode & S_IFMT) { case S_IFREG: 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); break; case S_IFDIR: di->di_flags |= cpu_to_be32(dip->i_diskflags & GFS2_DIF_INHERIT_JDATA); di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); di->di_size = cpu_to_be64(sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)); di->di_entries = cpu_to_be32(2); gfs2_init_dir(dibh, dip); break; case S_IFLNK: memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, size); break; } 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, const char *symname, unsigned int size, 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, symname, size, 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; inc_nlink(&ip->i_inode); if (S_ISDIR(ip->i_inode.i_mode)) inc_nlink(&ip->i_inode); 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_create_inode - Create a new inode * @dir: The parent directory * @dentry: The new dentry * @mode: The permissions on the new inode * @dev: For device nodes, this is the device number * @symname: For symlinks, this is the link destination * @size: The initial size of the inode (ignored for directories) * * Returns: 0 on success, or error code */ static int gfs2_create_inode(struct inode *dir, struct dentry *dentry, unsigned int mode, dev_t dev, const char *symname, unsigned int size) { const struct qstr *name = &dentry->d_name; struct gfs2_holder ghs[2]; struct inode *inode = NULL; struct gfs2_inode *dip = GFS2_I(dir); 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 -ENAMETOOLONG; error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, 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, symname, size, &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); 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); d_instantiate(dentry, inode); return 0; fail_gunlock2: gfs2_glock_dq_uninit(ghs + 1); if (inode && !IS_ERR(inode)) iput(inode); fail_gunlock: gfs2_glock_dq_uninit(ghs); fail: if (bh) brelse(bh); return 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 inode *inode; int ret; for (;;) { ret = gfs2_create_inode(dir, dentry, S_IFREG | mode, 0, NULL, 0); if (ret != -EEXIST || (nd && (nd->flags & LOOKUP_EXCL))) return ret; inode = gfs2_lookupi(dir, &dentry->d_name, 0); if (inode) { if (!IS_ERR(inode)) break; 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_sbd *sdp = GFS2_SB(dir); unsigned int size; size = strlen(symname); if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1) return -ENAMETOOLONG; return gfs2_create_inode(dir, dentry, S_IFLNK | S_IRWXUGO, 0, symname, size); } /** * 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) { return gfs2_create_inode(dir, dentry, S_IFDIR | mode, 0, NULL, 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 * @dev: The device specification of the special file * */ static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) { return gfs2_create_inode(dir, dentry, mode, dev, NULL, 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 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; } buf = kzalloc(size + 1, GFP_NOFS); if (!buf) buf = ERR_PTR(-ENOMEM); else memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size); 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, };