1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
7 #include <linux/slab.h>
8 #include <linux/spinlock.h>
9 #include <linux/completion.h>
10 #include <linux/buffer_head.h>
11 #include <linux/namei.h>
13 #include <linux/cred.h>
14 #include <linux/xattr.h>
15 #include <linux/posix_acl.h>
16 #include <linux/gfs2_ondisk.h>
17 #include <linux/crc32.h>
18 #include <linux/iomap.h>
19 #include <linux/security.h>
20 #include <linux/fiemap.h>
21 #include <linux/uaccess.h>
39 static const struct inode_operations gfs2_file_iops;
40 static const struct inode_operations gfs2_dir_iops;
41 static const struct inode_operations gfs2_symlink_iops;
44 * gfs2_set_iop - Sets inode operations
45 * @inode: The inode with correct i_mode filled in
47 * GFS2 lookup code fills in vfs inode contents based on info obtained
48 * from directory entry inside gfs2_inode_lookup().
51 static void gfs2_set_iop(struct inode *inode)
53 struct gfs2_sbd *sdp = GFS2_SB(inode);
54 umode_t mode = inode->i_mode;
57 inode->i_op = &gfs2_file_iops;
58 if (gfs2_localflocks(sdp))
59 inode->i_fop = &gfs2_file_fops_nolock;
61 inode->i_fop = &gfs2_file_fops;
62 } else if (S_ISDIR(mode)) {
63 inode->i_op = &gfs2_dir_iops;
64 if (gfs2_localflocks(sdp))
65 inode->i_fop = &gfs2_dir_fops_nolock;
67 inode->i_fop = &gfs2_dir_fops;
68 } else if (S_ISLNK(mode)) {
69 inode->i_op = &gfs2_symlink_iops;
71 inode->i_op = &gfs2_file_iops;
72 init_special_inode(inode, inode->i_mode, inode->i_rdev);
76 static int iget_test(struct inode *inode, void *opaque)
78 u64 no_addr = *(u64 *)opaque;
80 return GFS2_I(inode)->i_no_addr == no_addr;
83 static int iget_set(struct inode *inode, void *opaque)
85 u64 no_addr = *(u64 *)opaque;
87 GFS2_I(inode)->i_no_addr = no_addr;
88 inode->i_ino = no_addr;
93 * gfs2_inode_lookup - Lookup an inode
94 * @sb: The super block
95 * @type: The type of the inode
96 * @no_addr: The inode number
97 * @no_formal_ino: The inode generation number
98 * @blktype: Requested block type (GFS2_BLKST_DINODE or GFS2_BLKST_UNLINKED;
99 * GFS2_BLKST_FREE to indicate not to verify)
101 * If @type is DT_UNKNOWN, the inode type is fetched from disk.
103 * If @blktype is anything other than GFS2_BLKST_FREE (which is used as a
104 * placeholder because it doesn't otherwise make sense), the on-disk block type
105 * is verified to be @blktype.
107 * When @no_formal_ino is non-zero, this function will return ERR_PTR(-ESTALE)
108 * if it detects that @no_formal_ino doesn't match the actual inode generation
109 * number. However, it doesn't always know unless @type is DT_UNKNOWN.
111 * Returns: A VFS inode, or an error
114 struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned int type,
115 u64 no_addr, u64 no_formal_ino,
116 unsigned int blktype)
119 struct gfs2_inode *ip;
120 struct gfs2_holder i_gh;
123 gfs2_holder_mark_uninitialized(&i_gh);
124 inode = iget5_locked(sb, no_addr, iget_test, iget_set, &no_addr);
126 return ERR_PTR(-ENOMEM);
130 if (inode->i_state & I_NEW) {
131 struct gfs2_sbd *sdp = GFS2_SB(inode);
132 struct gfs2_glock *io_gl;
135 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE,
140 error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE,
146 * The only caller that sets @blktype to GFS2_BLKST_UNLINKED is
147 * delete_work_func(). Make sure not to cancel the delete work
148 * from within itself here.
150 if (blktype == GFS2_BLKST_UNLINKED)
151 extra_flags |= LM_FLAG_TRY;
153 gfs2_cancel_delete_work(io_gl);
154 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED,
155 GL_EXACT | GL_NOPID | extra_flags,
157 gfs2_glock_put(io_gl);
161 if (type == DT_UNKNOWN || blktype != GFS2_BLKST_FREE) {
163 * The GL_SKIP flag indicates to skip reading the inode
164 * block. We read the inode when instantiating it
165 * after possibly checking the block type.
167 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE,
174 gfs2_inode_already_deleted(ip->i_gl, no_formal_ino))
177 if (blktype != GFS2_BLKST_FREE) {
178 error = gfs2_check_blk_type(sdp, no_addr,
185 set_bit(GLF_INSTANTIATE_NEEDED, &ip->i_gl->gl_flags);
187 /* Lowest possible timestamp; will be overwritten in gfs2_dinode_in. */
188 inode->i_atime.tv_sec = 1LL << (8 * sizeof(inode->i_atime.tv_sec) - 1);
189 inode->i_atime.tv_nsec = 0;
191 glock_set_object(ip->i_gl, ip);
193 if (type == DT_UNKNOWN) {
194 /* Inode glock must be locked already */
195 error = gfs2_instantiate(&i_gh);
197 glock_clear_object(ip->i_gl, ip);
201 ip->i_no_formal_ino = no_formal_ino;
202 inode->i_mode = DT2IF(type);
205 if (gfs2_holder_initialized(&i_gh))
206 gfs2_glock_dq_uninit(&i_gh);
207 glock_set_object(ip->i_iopen_gh.gh_gl, ip);
210 unlock_new_inode(inode);
213 if (no_formal_ino && ip->i_no_formal_ino &&
214 no_formal_ino != ip->i_no_formal_ino) {
216 return ERR_PTR(-ESTALE);
222 if (error == GLR_TRYFAILED)
224 if (gfs2_holder_initialized(&ip->i_iopen_gh))
225 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
226 if (gfs2_holder_initialized(&i_gh))
227 gfs2_glock_dq_uninit(&i_gh);
229 gfs2_glock_put(ip->i_gl);
233 return ERR_PTR(error);
237 * gfs2_lookup_by_inum - look up an inode by inode number
238 * @sdp: The super block
239 * @no_addr: The inode number
240 * @no_formal_ino: The inode generation number (0 for any)
241 * @blktype: Requested block type (see gfs2_inode_lookup)
243 struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
244 u64 no_formal_ino, unsigned int blktype)
246 struct super_block *sb = sdp->sd_vfs;
250 inode = gfs2_inode_lookup(sb, DT_UNKNOWN, no_addr, no_formal_ino,
257 if (GFS2_I(inode)->i_diskflags & GFS2_DIF_SYSTEM)
264 return ERR_PTR(error);
268 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
272 gfs2_str2qstr(&qstr, name);
273 inode = gfs2_lookupi(dip, &qstr, 1);
274 /* gfs2_lookupi has inconsistent callers: vfs
275 * related routines expect NULL for no entry found,
276 * gfs2_lookup_simple callers expect ENOENT
277 * and do not check for NULL.
279 if (IS_ERR_OR_NULL(inode))
280 return inode ? inode : ERR_PTR(-ENOENT);
283 * Must not call back into the filesystem when allocating
284 * pages in the metadata inode's address space.
286 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
293 * gfs2_lookupi - Look up a filename in a directory and return its inode
294 * @dir: The inode of the directory containing the inode to look-up
295 * @name: The name of the inode to look for
296 * @is_root: If 1, ignore the caller's permissions
298 * This can be called via the VFS filldir function when NFS is doing
299 * a readdirplus and the inode which its intending to stat isn't
300 * already in cache. In this case we must not take the directory glock
301 * again, since the readdir call will have already taken that lock.
306 struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
309 struct super_block *sb = dir->i_sb;
310 struct gfs2_inode *dip = GFS2_I(dir);
311 struct gfs2_holder d_gh;
313 struct inode *inode = NULL;
315 gfs2_holder_mark_uninitialized(&d_gh);
316 if (!name->len || name->len > GFS2_FNAMESIZE)
317 return ERR_PTR(-ENAMETOOLONG);
319 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
320 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
321 dir == d_inode(sb->s_root))) {
326 if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) {
327 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
329 return ERR_PTR(error);
333 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_EXEC);
338 inode = gfs2_dir_search(dir, name, false);
340 error = PTR_ERR(inode);
342 if (gfs2_holder_initialized(&d_gh))
343 gfs2_glock_dq_uninit(&d_gh);
344 if (error == -ENOENT)
346 return inode ? inode : ERR_PTR(error);
350 * create_ok - OK to create a new on-disk inode here?
351 * @dip: Directory in which dinode is to be created
352 * @name: Name of new dinode
358 static int create_ok(struct gfs2_inode *dip, const struct qstr *name,
363 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode,
364 MAY_WRITE | MAY_EXEC);
368 /* Don't create entries in an unlinked directory */
369 if (!dip->i_inode.i_nlink)
372 if (dip->i_entries == (u32)-1)
374 if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1)
380 static void munge_mode_uid_gid(const struct gfs2_inode *dip,
383 if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir &&
384 (dip->i_inode.i_mode & S_ISUID) &&
385 !uid_eq(dip->i_inode.i_uid, GLOBAL_ROOT_UID)) {
386 if (S_ISDIR(inode->i_mode))
387 inode->i_mode |= S_ISUID;
388 else if (!uid_eq(dip->i_inode.i_uid, current_fsuid()))
389 inode->i_mode &= ~07111;
390 inode->i_uid = dip->i_inode.i_uid;
392 inode->i_uid = current_fsuid();
394 if (dip->i_inode.i_mode & S_ISGID) {
395 if (S_ISDIR(inode->i_mode))
396 inode->i_mode |= S_ISGID;
397 inode->i_gid = dip->i_inode.i_gid;
399 inode->i_gid = current_fsgid();
402 static int alloc_dinode(struct gfs2_inode *ip, u32 flags, unsigned *dblocks)
404 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
405 struct gfs2_alloc_parms ap = { .target = *dblocks, .aflags = flags, };
408 error = gfs2_quota_lock_check(ip, &ap);
412 error = gfs2_inplace_reserve(ip, &ap);
416 error = gfs2_trans_begin(sdp, (*dblocks * RES_RG_BIT) + RES_STATFS + RES_QUOTA, 0);
420 error = gfs2_alloc_blocks(ip, &ip->i_no_addr, dblocks, 1, &ip->i_generation);
424 ip->i_no_formal_ino = ip->i_generation;
425 ip->i_inode.i_ino = ip->i_no_addr;
426 ip->i_goal = ip->i_no_addr;
428 ip->i_eattr = ip->i_no_addr + 1;
433 gfs2_inplace_release(ip);
435 gfs2_quota_unlock(ip);
440 static void gfs2_init_dir(struct buffer_head *dibh,
441 const struct gfs2_inode *parent)
443 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
444 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
446 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
447 dent->de_inum = di->di_num; /* already GFS2 endian */
448 dent->de_type = cpu_to_be16(DT_DIR);
450 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
451 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
452 gfs2_inum_out(parent, dent);
453 dent->de_type = cpu_to_be16(DT_DIR);
458 * gfs2_init_xattr - Initialise an xattr block for a new inode
459 * @ip: The inode in question
461 * This sets up an empty xattr block for a new inode, ready to
462 * take any ACLs, LSM xattrs, etc.
465 static void gfs2_init_xattr(struct gfs2_inode *ip)
467 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
468 struct buffer_head *bh;
469 struct gfs2_ea_header *ea;
471 bh = gfs2_meta_new(ip->i_gl, ip->i_eattr);
472 gfs2_trans_add_meta(ip->i_gl, bh);
473 gfs2_metatype_set(bh, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
474 gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
476 ea = GFS2_EA_BH2FIRST(bh);
477 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
478 ea->ea_type = GFS2_EATYPE_UNUSED;
479 ea->ea_flags = GFS2_EAFLAG_LAST;
485 * init_dinode - Fill in a new dinode structure
486 * @dip: The directory this inode is being created in
488 * @symname: The symlink destination (if a symlink)
492 static void init_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip,
495 struct gfs2_dinode *di;
496 struct buffer_head *dibh;
498 dibh = gfs2_meta_new(ip->i_gl, ip->i_no_addr);
499 gfs2_trans_add_meta(ip->i_gl, dibh);
500 di = (struct gfs2_dinode *)dibh->b_data;
501 gfs2_dinode_out(ip, di);
503 di->di_major = cpu_to_be32(imajor(&ip->i_inode));
504 di->di_minor = cpu_to_be32(iminor(&ip->i_inode));
508 memset(&di->__pad4, 0, sizeof(di->__pad4));
509 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
510 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
512 switch(ip->i_inode.i_mode & S_IFMT) {
514 gfs2_init_dir(dibh, dip);
517 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname, ip->i_inode.i_size);
521 set_buffer_uptodate(dibh);
526 * gfs2_trans_da_blks - Calculate number of blocks to link inode
527 * @dip: The directory we are linking into
528 * @da: The dir add information
529 * @nr_inodes: The number of inodes involved
531 * This calculate the number of blocks we need to reserve in a
532 * transaction to link @nr_inodes into a directory. In most cases
533 * @nr_inodes will be 2 (the directory plus the inode being linked in)
534 * but in case of rename, 4 may be required.
536 * Returns: Number of blocks
539 static unsigned gfs2_trans_da_blks(const struct gfs2_inode *dip,
540 const struct gfs2_diradd *da,
543 return da->nr_blocks + gfs2_rg_blocks(dip, da->nr_blocks) +
544 (nr_inodes * RES_DINODE) + RES_QUOTA + RES_STATFS;
547 static int link_dinode(struct gfs2_inode *dip, const struct qstr *name,
548 struct gfs2_inode *ip, struct gfs2_diradd *da)
550 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
551 struct gfs2_alloc_parms ap = { .target = da->nr_blocks, };
555 error = gfs2_quota_lock_check(dip, &ap);
557 goto fail_quota_locks;
559 error = gfs2_inplace_reserve(dip, &ap);
561 goto fail_quota_locks;
563 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, da, 2), 0);
567 error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0);
569 goto fail_quota_locks;
572 error = gfs2_dir_add(&dip->i_inode, name, ip, da);
576 gfs2_inplace_release(dip);
578 gfs2_quota_unlock(dip);
582 static int gfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
585 const struct xattr *xattr;
588 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
589 err = __gfs2_xattr_set(inode, xattr->name, xattr->value,
591 GFS2_EATYPE_SECURITY);
599 * gfs2_create_inode - Create a new inode
600 * @dir: The parent directory
601 * @dentry: The new dentry
602 * @file: If non-NULL, the file which is being opened
603 * @mode: The permissions on the new inode
604 * @dev: For device nodes, this is the device number
605 * @symname: For symlinks, this is the link destination
606 * @size: The initial size of the inode (ignored for directories)
607 * @excl: Force fail if inode exists
609 * FIXME: Change to allocate the disk blocks and write them out in the same
610 * transaction. That way, we can no longer end up in a situation in which an
611 * inode is allocated, the node crashes, and the block looks like a valid
612 * inode. (With atomic creates in place, we will also no longer need to zero
613 * the link count and dirty the inode here on failure.)
615 * Returns: 0 on success, or error code
618 static int gfs2_create_inode(struct inode *dir, struct dentry *dentry,
620 umode_t mode, dev_t dev, const char *symname,
621 unsigned int size, int excl)
623 const struct qstr *name = &dentry->d_name;
624 struct posix_acl *default_acl, *acl;
625 struct gfs2_holder d_gh, gh;
626 struct inode *inode = NULL;
627 struct gfs2_inode *dip = GFS2_I(dir), *ip;
628 struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
629 struct gfs2_glock *io_gl;
633 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
635 if (!name->len || name->len > GFS2_FNAMESIZE)
636 return -ENAMETOOLONG;
638 error = gfs2_qa_get(dip);
642 error = gfs2_rindex_update(sdp);
646 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
649 gfs2_holder_mark_uninitialized(&gh);
651 error = create_ok(dip, name, mode);
655 inode = gfs2_dir_search(dir, &dentry->d_name, !S_ISREG(mode) || excl);
656 error = PTR_ERR(inode);
657 if (!IS_ERR(inode)) {
658 if (S_ISDIR(inode->i_mode)) {
660 inode = ERR_PTR(-EISDIR);
663 d_instantiate(dentry, inode);
666 if (S_ISREG(inode->i_mode))
667 error = finish_open(file, dentry, gfs2_open_common);
669 error = finish_no_open(file, NULL);
671 gfs2_glock_dq_uninit(&d_gh);
673 } else if (error != -ENOENT) {
677 error = gfs2_diradd_alloc_required(dir, name, &da);
681 inode = new_inode(sdp->sd_vfs);
687 error = posix_acl_create(dir, &mode, &default_acl, &acl);
691 error = gfs2_qa_get(ip);
695 inode->i_mode = mode;
696 set_nlink(inode, S_ISDIR(mode) ? 2 : 1);
698 inode->i_size = size;
699 inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode);
700 munge_mode_uid_gid(dip, inode);
701 check_and_update_goal(dip);
702 ip->i_goal = dip->i_goal;
708 ip->i_no_addr = 0; /* Temporarily zero until real addr is assigned */
710 switch(mode & S_IFMT) {
712 if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) ||
713 gfs2_tune_get(sdp, gt_new_files_jdata))
714 ip->i_diskflags |= GFS2_DIF_JDATA;
715 gfs2_set_aops(inode);
718 ip->i_diskflags |= (dip->i_diskflags & GFS2_DIF_INHERIT_JDATA);
719 ip->i_diskflags |= GFS2_DIF_JDATA;
724 /* Force SYSTEM flag on all files and subdirs of a SYSTEM directory */
725 if (dip->i_diskflags & GFS2_DIF_SYSTEM)
726 ip->i_diskflags |= GFS2_DIF_SYSTEM;
728 gfs2_set_inode_flags(inode);
730 if ((GFS2_I(d_inode(sdp->sd_root_dir)) == dip) ||
731 (dip->i_diskflags & GFS2_DIF_TOPDIR))
732 aflags |= GFS2_AF_ORLOV;
734 if (default_acl || acl)
737 error = alloc_dinode(ip, aflags, &blocks);
739 goto fail_free_inode;
741 gfs2_set_inode_blocks(inode, blocks);
743 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
745 goto fail_free_inode;
747 error = gfs2_glock_get(sdp, ip->i_no_addr, &gfs2_iopen_glops, CREATE, &io_gl);
749 goto fail_free_inode;
750 gfs2_cancel_delete_work(io_gl);
753 error = insert_inode_locked4(inode, ip->i_no_addr, iget_test, &ip->i_no_addr);
759 error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT | GL_NOPID,
764 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
768 error = gfs2_trans_begin(sdp, blocks, 0);
774 init_dinode(dip, ip, symname);
777 glock_set_object(ip->i_gl, ip);
778 glock_set_object(io_gl, ip);
782 error = __gfs2_set_acl(inode, default_acl, ACL_TYPE_DEFAULT);
785 posix_acl_release(default_acl);
789 error = __gfs2_set_acl(inode, acl, ACL_TYPE_ACCESS);
792 posix_acl_release(acl);
796 error = security_inode_init_security(&ip->i_inode, &dip->i_inode, name,
797 &gfs2_initxattrs, NULL);
801 error = link_dinode(dip, name, ip, &da);
805 mark_inode_dirty(inode);
806 d_instantiate(dentry, inode);
807 /* After instantiate, errors should result in evict which will destroy
808 * both inode and iopen glocks properly. */
810 file->f_mode |= FMODE_CREATED;
811 error = finish_open(file, dentry, gfs2_open_common);
813 gfs2_glock_dq_uninit(&d_gh);
815 gfs2_glock_dq_uninit(&gh);
816 gfs2_glock_put(io_gl);
818 unlock_new_inode(inode);
822 glock_clear_object(ip->i_gl, ip);
823 glock_clear_object(io_gl, ip);
825 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
827 gfs2_glock_put(io_gl);
830 gfs2_glock_put(ip->i_gl);
833 gfs2_rs_deltree(&ip->i_res);
836 posix_acl_release(default_acl);
837 posix_acl_release(acl);
839 gfs2_dir_no_add(&da);
840 gfs2_glock_dq_uninit(&d_gh);
841 if (!IS_ERR_OR_NULL(inode)) {
842 set_bit(GIF_ALLOC_FAILED, &ip->i_flags);
845 mark_inode_dirty(inode);
846 if (inode->i_state & I_NEW)
851 if (gfs2_holder_initialized(&gh))
852 gfs2_glock_dq_uninit(&gh);
859 * gfs2_create - Create a file
860 * @idmap: idmap of the mount the inode was found from
861 * @dir: The directory in which to create the file
862 * @dentry: The dentry of the new file
863 * @mode: The mode of the new file
864 * @excl: Force fail if inode exists
869 static int gfs2_create(struct mnt_idmap *idmap, struct inode *dir,
870 struct dentry *dentry, umode_t mode, bool excl)
872 return gfs2_create_inode(dir, dentry, NULL, S_IFREG | mode, 0, NULL, 0, excl);
876 * __gfs2_lookup - Look up a filename in a directory and return its inode
877 * @dir: The directory inode
878 * @dentry: The dentry of the new inode
879 * @file: File to be opened
885 static struct dentry *__gfs2_lookup(struct inode *dir, struct dentry *dentry,
890 struct gfs2_holder gh;
891 struct gfs2_glock *gl;
894 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
900 return ERR_CAST(inode);
902 gl = GFS2_I(inode)->i_gl;
903 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
906 return ERR_PTR(error);
909 d = d_splice_alias(inode, dentry);
911 gfs2_glock_dq_uninit(&gh);
914 if (file && S_ISREG(inode->i_mode))
915 error = finish_open(file, dentry, gfs2_open_common);
917 gfs2_glock_dq_uninit(&gh);
920 return ERR_PTR(error);
925 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
928 return __gfs2_lookup(dir, dentry, NULL);
932 * gfs2_link - Link to a file
933 * @old_dentry: The inode to link
934 * @dir: Add link to this directory
935 * @dentry: The name of the link
937 * Link the inode in "old_dentry" into the directory "dir" with the
943 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
944 struct dentry *dentry)
946 struct gfs2_inode *dip = GFS2_I(dir);
947 struct gfs2_sbd *sdp = GFS2_SB(dir);
948 struct inode *inode = d_inode(old_dentry);
949 struct gfs2_inode *ip = GFS2_I(inode);
950 struct gfs2_holder d_gh, gh;
951 struct buffer_head *dibh;
952 struct gfs2_diradd da = { .bh = NULL, .save_loc = 1, };
955 if (S_ISDIR(inode->i_mode))
958 error = gfs2_qa_get(dip);
962 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
963 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
965 error = gfs2_glock_nq(&d_gh);
969 error = gfs2_glock_nq(&gh);
974 if (inode->i_nlink == 0)
977 error = gfs2_permission(&nop_mnt_idmap, dir, MAY_WRITE | MAY_EXEC);
981 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
993 if (!dip->i_inode.i_nlink)
996 if (dip->i_entries == (u32)-1)
999 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1002 if (ip->i_inode.i_nlink == (u32)-1)
1005 error = gfs2_diradd_alloc_required(dir, &dentry->d_name, &da);
1010 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1011 error = gfs2_quota_lock_check(dip, &ap);
1015 error = gfs2_inplace_reserve(dip, &ap);
1019 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(dip, &da, 2), 0);
1023 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
1028 error = gfs2_meta_inode_buffer(ip, &dibh);
1032 error = gfs2_dir_add(dir, &dentry->d_name, ip, &da);
1036 gfs2_trans_add_meta(ip->i_gl, dibh);
1037 inc_nlink(&ip->i_inode);
1038 inode_set_ctime_current(&ip->i_inode);
1040 d_instantiate(dentry, inode);
1041 mark_inode_dirty(inode);
1046 gfs2_trans_end(sdp);
1049 gfs2_inplace_release(dip);
1052 gfs2_quota_unlock(dip);
1054 gfs2_dir_no_add(&da);
1057 gfs2_glock_dq(&d_gh);
1060 gfs2_holder_uninit(&d_gh);
1061 gfs2_holder_uninit(&gh);
1066 * gfs2_unlink_ok - check to see that a inode is still in a directory
1067 * @dip: the directory
1068 * @name: the name of the file
1071 * Assumes that the lock on (at least) @dip is held.
1073 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1076 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
1077 const struct gfs2_inode *ip)
1081 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
1084 if ((dip->i_inode.i_mode & S_ISVTX) &&
1085 !uid_eq(dip->i_inode.i_uid, current_fsuid()) &&
1086 !uid_eq(ip->i_inode.i_uid, current_fsuid()) && !capable(CAP_FOWNER))
1089 if (IS_APPEND(&dip->i_inode))
1092 error = gfs2_permission(&nop_mnt_idmap, &dip->i_inode,
1093 MAY_WRITE | MAY_EXEC);
1097 return gfs2_dir_check(&dip->i_inode, name, ip);
1101 * gfs2_unlink_inode - Removes an inode from its parent dir and unlinks it
1102 * @dip: The parent directory
1103 * @dentry: The dentry to unlink
1105 * Called with all the locks and in a transaction. This will only be
1106 * called for a directory after it has been checked to ensure it is empty.
1108 * Returns: 0 on success, or an error
1111 static int gfs2_unlink_inode(struct gfs2_inode *dip,
1112 const struct dentry *dentry)
1114 struct inode *inode = d_inode(dentry);
1115 struct gfs2_inode *ip = GFS2_I(inode);
1118 error = gfs2_dir_del(dip, dentry);
1123 inode_set_ctime_current(inode);
1124 if (S_ISDIR(inode->i_mode))
1128 mark_inode_dirty(inode);
1129 if (inode->i_nlink == 0)
1130 gfs2_unlink_di(inode);
1136 * gfs2_unlink - Unlink an inode (this does rmdir as well)
1137 * @dir: The inode of the directory containing the inode to unlink
1138 * @dentry: The file itself
1140 * This routine uses the type of the inode as a flag to figure out
1141 * whether this is an unlink or an rmdir.
1146 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
1148 struct gfs2_inode *dip = GFS2_I(dir);
1149 struct gfs2_sbd *sdp = GFS2_SB(dir);
1150 struct inode *inode = d_inode(dentry);
1151 struct gfs2_inode *ip = GFS2_I(inode);
1152 struct gfs2_holder d_gh, r_gh, gh;
1153 struct gfs2_rgrpd *rgd;
1156 error = gfs2_rindex_update(sdp);
1162 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, &d_gh);
1163 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1165 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1169 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE, &r_gh);
1172 error = gfs2_glock_nq(&d_gh);
1176 error = gfs2_glock_nq(&gh);
1181 if (inode->i_nlink == 0)
1184 if (S_ISDIR(inode->i_mode)) {
1186 if (ip->i_entries > 2 || inode->i_nlink > 2)
1190 error = gfs2_glock_nq(&r_gh); /* rgrp */
1194 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
1198 error = gfs2_trans_begin(sdp, 2*RES_DINODE + 3*RES_LEAF + RES_RG_BIT, 0);
1202 error = gfs2_unlink_inode(dip, dentry);
1203 gfs2_trans_end(sdp);
1206 gfs2_glock_dq(&r_gh);
1210 gfs2_glock_dq(&d_gh);
1212 gfs2_holder_uninit(&r_gh);
1214 gfs2_holder_uninit(&gh);
1215 gfs2_holder_uninit(&d_gh);
1220 * gfs2_symlink - Create a symlink
1221 * @idmap: idmap of the mount the inode was found from
1222 * @dir: The directory to create the symlink in
1223 * @dentry: The dentry to put the symlink in
1224 * @symname: The thing which the link points to
1229 static int gfs2_symlink(struct mnt_idmap *idmap, struct inode *dir,
1230 struct dentry *dentry, const char *symname)
1234 size = strlen(symname);
1235 if (size >= gfs2_max_stuffed_size(GFS2_I(dir)))
1236 return -ENAMETOOLONG;
1238 return gfs2_create_inode(dir, dentry, NULL, S_IFLNK | S_IRWXUGO, 0, symname, size, 0);
1242 * gfs2_mkdir - Make a directory
1243 * @idmap: idmap of the mount the inode was found from
1244 * @dir: The parent directory of the new one
1245 * @dentry: The dentry of the new directory
1246 * @mode: The mode of the new directory
1251 static int gfs2_mkdir(struct mnt_idmap *idmap, struct inode *dir,
1252 struct dentry *dentry, umode_t mode)
1254 unsigned dsize = gfs2_max_stuffed_size(GFS2_I(dir));
1255 return gfs2_create_inode(dir, dentry, NULL, S_IFDIR | mode, 0, NULL, dsize, 0);
1259 * gfs2_mknod - Make a special file
1260 * @idmap: idmap of the mount the inode was found from
1261 * @dir: The directory in which the special file will reside
1262 * @dentry: The dentry of the special file
1263 * @mode: The mode of the special file
1264 * @dev: The device specification of the special file
1268 static int gfs2_mknod(struct mnt_idmap *idmap, struct inode *dir,
1269 struct dentry *dentry, umode_t mode, dev_t dev)
1271 return gfs2_create_inode(dir, dentry, NULL, mode, dev, NULL, 0, 0);
1275 * gfs2_atomic_open - Atomically open a file
1276 * @dir: The directory
1277 * @dentry: The proposed new entry
1278 * @file: The proposed new struct file
1279 * @flags: open flags
1282 * Returns: error code or 0 for success
1285 static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
1286 struct file *file, unsigned flags,
1290 bool excl = !!(flags & O_EXCL);
1292 if (!d_in_lookup(dentry))
1295 d = __gfs2_lookup(dir, dentry, file);
1300 if (d_really_is_positive(dentry)) {
1301 if (!(file->f_mode & FMODE_OPENED))
1302 return finish_no_open(file, d);
1304 return excl && (flags & O_CREAT) ? -EEXIST : 0;
1310 if (!(flags & O_CREAT))
1313 return gfs2_create_inode(dir, dentry, file, S_IFREG | mode, 0, NULL, 0, excl);
1317 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1321 * Follow @to back to the root and make sure we don't encounter @this
1322 * Assumes we already hold the rename lock.
1327 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1329 struct inode *dir = &to->i_inode;
1330 struct super_block *sb = dir->i_sb;
1337 if (dir == &this->i_inode) {
1341 if (dir == d_inode(sb->s_root)) {
1346 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
1352 error = PTR_ERR(tmp);
1366 * update_moved_ino - Update an inode that's being moved
1367 * @ip: The inode being moved
1368 * @ndip: The parent directory of the new filename
1369 * @dir_rename: True of ip is a directory
1374 static int update_moved_ino(struct gfs2_inode *ip, struct gfs2_inode *ndip,
1378 return gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
1380 inode_set_ctime_current(&ip->i_inode);
1381 mark_inode_dirty_sync(&ip->i_inode);
1387 * gfs2_rename - Rename a file
1388 * @odir: Parent directory of old file name
1389 * @odentry: The old dentry of the file
1390 * @ndir: Parent directory of new file name
1391 * @ndentry: The new dentry of the file
1396 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
1397 struct inode *ndir, struct dentry *ndentry)
1399 struct gfs2_inode *odip = GFS2_I(odir);
1400 struct gfs2_inode *ndip = GFS2_I(ndir);
1401 struct gfs2_inode *ip = GFS2_I(d_inode(odentry));
1402 struct gfs2_inode *nip = NULL;
1403 struct gfs2_sbd *sdp = GFS2_SB(odir);
1404 struct gfs2_holder ghs[4], r_gh, rd_gh;
1405 struct gfs2_rgrpd *nrgd;
1406 unsigned int num_gh;
1408 struct gfs2_diradd da = { .nr_blocks = 0, .save_loc = 0, };
1412 gfs2_holder_mark_uninitialized(&r_gh);
1413 gfs2_holder_mark_uninitialized(&rd_gh);
1414 if (d_really_is_positive(ndentry)) {
1415 nip = GFS2_I(d_inode(ndentry));
1420 error = gfs2_rindex_update(sdp);
1424 error = gfs2_qa_get(ndip);
1429 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1434 if (S_ISDIR(ip->i_inode.i_mode)) {
1436 /* don't move a directory into its subdir */
1437 error = gfs2_ok_to_move(ip, ndip);
1444 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1446 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE,GL_ASYNC,
1450 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1454 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1459 for (x = 0; x < num_gh; x++) {
1460 error = gfs2_glock_nq(ghs + x);
1464 error = gfs2_glock_async_wait(num_gh, ghs);
1469 /* Grab the resource group glock for unlink flag twiddling.
1470 * This is the case where the target dinode already exists
1471 * so we unlink before doing the rename.
1473 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr, 1);
1478 error = gfs2_glock_nq_init(nrgd->rd_gl, LM_ST_EXCLUSIVE,
1479 LM_FLAG_NODE_SCOPE, &rd_gh);
1485 if (ip->i_inode.i_nlink == 0)
1488 /* Check out the old directory */
1490 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
1494 /* Check out the new directory */
1497 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1501 if (nip->i_inode.i_nlink == 0) {
1506 if (S_ISDIR(nip->i_inode.i_mode)) {
1507 if (nip->i_entries < 2) {
1508 gfs2_consist_inode(nip);
1512 if (nip->i_entries > 2) {
1518 error = gfs2_permission(&nop_mnt_idmap, ndir,
1519 MAY_WRITE | MAY_EXEC);
1523 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
1536 if (!ndip->i_inode.i_nlink) {
1540 if (ndip->i_entries == (u32)-1) {
1544 if (S_ISDIR(ip->i_inode.i_mode) &&
1545 ndip->i_inode.i_nlink == (u32)-1) {
1552 /* Check out the dir to be renamed */
1555 error = gfs2_permission(&nop_mnt_idmap, d_inode(odentry),
1562 error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name, &da);
1568 struct gfs2_alloc_parms ap = { .target = da.nr_blocks, };
1569 error = gfs2_quota_lock_check(ndip, &ap);
1573 error = gfs2_inplace_reserve(ndip, &ap);
1577 error = gfs2_trans_begin(sdp, gfs2_trans_da_blks(ndip, &da, 4) +
1578 4 * RES_LEAF + 4, 0);
1582 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
1583 5 * RES_LEAF + 4, 0);
1588 /* Remove the target file, if it exists */
1591 error = gfs2_unlink_inode(ndip, ndentry);
1593 error = update_moved_ino(ip, ndip, dir_rename);
1597 error = gfs2_dir_del(odip, odentry);
1601 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, &da);
1606 gfs2_trans_end(sdp);
1609 gfs2_inplace_release(ndip);
1612 gfs2_quota_unlock(ndip);
1614 gfs2_dir_no_add(&da);
1615 if (gfs2_holder_initialized(&rd_gh))
1616 gfs2_glock_dq_uninit(&rd_gh);
1619 if (gfs2_holder_queued(ghs + x))
1620 gfs2_glock_dq(ghs + x);
1621 gfs2_holder_uninit(ghs + x);
1624 if (gfs2_holder_initialized(&r_gh))
1625 gfs2_glock_dq_uninit(&r_gh);
1632 * gfs2_exchange - exchange two files
1633 * @odir: Parent directory of old file name
1634 * @odentry: The old dentry of the file
1635 * @ndir: Parent directory of new file name
1636 * @ndentry: The new dentry of the file
1637 * @flags: The rename flags
1642 static int gfs2_exchange(struct inode *odir, struct dentry *odentry,
1643 struct inode *ndir, struct dentry *ndentry,
1646 struct gfs2_inode *odip = GFS2_I(odir);
1647 struct gfs2_inode *ndip = GFS2_I(ndir);
1648 struct gfs2_inode *oip = GFS2_I(odentry->d_inode);
1649 struct gfs2_inode *nip = GFS2_I(ndentry->d_inode);
1650 struct gfs2_sbd *sdp = GFS2_SB(odir);
1651 struct gfs2_holder ghs[4], r_gh;
1652 unsigned int num_gh;
1654 umode_t old_mode = oip->i_inode.i_mode;
1655 umode_t new_mode = nip->i_inode.i_mode;
1658 gfs2_holder_mark_uninitialized(&r_gh);
1659 error = gfs2_rindex_update(sdp);
1664 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
1669 if (S_ISDIR(old_mode)) {
1670 /* don't move a directory into its subdir */
1671 error = gfs2_ok_to_move(oip, ndip);
1676 if (S_ISDIR(new_mode)) {
1677 /* don't move a directory into its subdir */
1678 error = gfs2_ok_to_move(nip, odip);
1685 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs);
1687 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC,
1691 gfs2_holder_init(oip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1694 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, GL_ASYNC, ghs + num_gh);
1697 for (x = 0; x < num_gh; x++) {
1698 error = gfs2_glock_nq(ghs + x);
1703 error = gfs2_glock_async_wait(num_gh, ghs);
1708 if (oip->i_inode.i_nlink == 0 || nip->i_inode.i_nlink == 0)
1711 error = gfs2_unlink_ok(odip, &odentry->d_name, oip);
1714 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
1718 if (S_ISDIR(old_mode)) {
1719 error = gfs2_permission(&nop_mnt_idmap, odentry->d_inode,
1724 if (S_ISDIR(new_mode)) {
1725 error = gfs2_permission(&nop_mnt_idmap, ndentry->d_inode,
1730 error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 4 * RES_LEAF, 0);
1734 error = update_moved_ino(oip, ndip, S_ISDIR(old_mode));
1738 error = update_moved_ino(nip, odip, S_ISDIR(new_mode));
1742 error = gfs2_dir_mvino(ndip, &ndentry->d_name, oip,
1747 error = gfs2_dir_mvino(odip, &odentry->d_name, nip,
1753 if (S_ISDIR(new_mode) && !S_ISDIR(old_mode)) {
1754 inc_nlink(&odip->i_inode);
1755 drop_nlink(&ndip->i_inode);
1756 } else if (S_ISDIR(old_mode) && !S_ISDIR(new_mode)) {
1757 inc_nlink(&ndip->i_inode);
1758 drop_nlink(&odip->i_inode);
1761 mark_inode_dirty(&ndip->i_inode);
1763 mark_inode_dirty(&odip->i_inode);
1766 gfs2_trans_end(sdp);
1769 if (gfs2_holder_queued(ghs + x))
1770 gfs2_glock_dq(ghs + x);
1771 gfs2_holder_uninit(ghs + x);
1774 if (gfs2_holder_initialized(&r_gh))
1775 gfs2_glock_dq_uninit(&r_gh);
1780 static int gfs2_rename2(struct mnt_idmap *idmap, struct inode *odir,
1781 struct dentry *odentry, struct inode *ndir,
1782 struct dentry *ndentry, unsigned int flags)
1784 flags &= ~RENAME_NOREPLACE;
1786 if (flags & ~RENAME_EXCHANGE)
1789 if (flags & RENAME_EXCHANGE)
1790 return gfs2_exchange(odir, odentry, ndir, ndentry, flags);
1792 return gfs2_rename(odir, odentry, ndir, ndentry);
1796 * gfs2_get_link - Follow a symbolic link
1797 * @dentry: The dentry of the link
1798 * @inode: The inode of the link
1799 * @done: destructor for return value
1801 * This can handle symlinks of any size.
1803 * Returns: 0 on success or error code
1806 static const char *gfs2_get_link(struct dentry *dentry,
1807 struct inode *inode,
1808 struct delayed_call *done)
1810 struct gfs2_inode *ip = GFS2_I(inode);
1811 struct gfs2_holder i_gh;
1812 struct buffer_head *dibh;
1818 return ERR_PTR(-ECHILD);
1820 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
1821 error = gfs2_glock_nq(&i_gh);
1823 gfs2_holder_uninit(&i_gh);
1824 return ERR_PTR(error);
1827 size = (unsigned int)i_size_read(&ip->i_inode);
1829 gfs2_consist_inode(ip);
1830 buf = ERR_PTR(-EIO);
1834 error = gfs2_meta_inode_buffer(ip, &dibh);
1836 buf = ERR_PTR(error);
1840 buf = kzalloc(size + 1, GFP_NOFS);
1842 buf = ERR_PTR(-ENOMEM);
1844 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), size);
1847 gfs2_glock_dq_uninit(&i_gh);
1849 set_delayed_call(done, kfree_link, buf);
1855 * @idmap: idmap of the mount the inode was found from
1857 * @mask: The mask to be tested
1859 * This may be called from the VFS directly, or from within GFS2 with the
1860 * inode locked, so we look to see if the glock is already locked and only
1861 * lock the glock if its not already been done.
1866 int gfs2_permission(struct mnt_idmap *idmap, struct inode *inode,
1869 int may_not_block = mask & MAY_NOT_BLOCK;
1870 struct gfs2_inode *ip;
1871 struct gfs2_holder i_gh;
1872 struct gfs2_glock *gl;
1875 gfs2_holder_mark_uninitialized(&i_gh);
1877 gl = rcu_dereference_check(ip->i_gl, !may_not_block);
1878 if (unlikely(!gl)) {
1879 /* inode is getting torn down, must be RCU mode */
1880 WARN_ON_ONCE(!may_not_block);
1883 if (gfs2_glock_is_locked_by_me(gl) == NULL) {
1886 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1891 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1894 error = generic_permission(&nop_mnt_idmap, inode, mask);
1895 if (gfs2_holder_initialized(&i_gh))
1896 gfs2_glock_dq_uninit(&i_gh);
1901 static int __gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1903 setattr_copy(&nop_mnt_idmap, inode, attr);
1904 mark_inode_dirty(inode);
1908 static int gfs2_setattr_simple(struct inode *inode, struct iattr *attr)
1912 if (current->journal_info)
1913 return __gfs2_setattr_simple(inode, attr);
1915 error = gfs2_trans_begin(GFS2_SB(inode), RES_DINODE, 0);
1919 error = __gfs2_setattr_simple(inode, attr);
1920 gfs2_trans_end(GFS2_SB(inode));
1924 static int setattr_chown(struct inode *inode, struct iattr *attr)
1926 struct gfs2_inode *ip = GFS2_I(inode);
1927 struct gfs2_sbd *sdp = GFS2_SB(inode);
1931 struct gfs2_alloc_parms ap;
1933 ouid = inode->i_uid;
1934 ogid = inode->i_gid;
1935 nuid = attr->ia_uid;
1936 ngid = attr->ia_gid;
1938 if (!(attr->ia_valid & ATTR_UID) || uid_eq(ouid, nuid))
1939 ouid = nuid = NO_UID_QUOTA_CHANGE;
1940 if (!(attr->ia_valid & ATTR_GID) || gid_eq(ogid, ngid))
1941 ogid = ngid = NO_GID_QUOTA_CHANGE;
1942 error = gfs2_qa_get(ip);
1946 error = gfs2_rindex_update(sdp);
1950 error = gfs2_quota_lock(ip, nuid, ngid);
1954 ap.target = gfs2_get_inode_blocks(&ip->i_inode);
1956 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1957 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1958 error = gfs2_quota_check(ip, nuid, ngid, &ap);
1963 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1967 error = gfs2_setattr_simple(inode, attr);
1971 if (!uid_eq(ouid, NO_UID_QUOTA_CHANGE) ||
1972 !gid_eq(ogid, NO_GID_QUOTA_CHANGE)) {
1973 gfs2_quota_change(ip, -(s64)ap.target, ouid, ogid);
1974 gfs2_quota_change(ip, ap.target, nuid, ngid);
1978 gfs2_trans_end(sdp);
1980 gfs2_quota_unlock(ip);
1987 * gfs2_setattr - Change attributes on an inode
1988 * @idmap: idmap of the mount the inode was found from
1989 * @dentry: The dentry which is changing
1990 * @attr: The structure describing the change
1992 * The VFS layer wants to change one or more of an inodes attributes. Write
1993 * that change out to disk.
1998 static int gfs2_setattr(struct mnt_idmap *idmap,
1999 struct dentry *dentry, struct iattr *attr)
2001 struct inode *inode = d_inode(dentry);
2002 struct gfs2_inode *ip = GFS2_I(inode);
2003 struct gfs2_holder i_gh;
2006 error = gfs2_qa_get(ip);
2010 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
2014 error = may_setattr(&nop_mnt_idmap, inode, attr->ia_valid);
2018 error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
2022 if (attr->ia_valid & ATTR_SIZE)
2023 error = gfs2_setattr_size(inode, attr->ia_size);
2024 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
2025 error = setattr_chown(inode, attr);
2027 error = gfs2_setattr_simple(inode, attr);
2028 if (!error && attr->ia_valid & ATTR_MODE)
2029 error = posix_acl_chmod(&nop_mnt_idmap, dentry,
2035 mark_inode_dirty(inode);
2036 gfs2_glock_dq_uninit(&i_gh);
2043 * gfs2_getattr - Read out an inode's attributes
2044 * @idmap: idmap of the mount the inode was found from
2045 * @path: Object to query
2046 * @stat: The inode's stats
2047 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests
2048 * @flags: AT_STATX_xxx setting
2050 * This may be called from the VFS directly, or from within GFS2 with the
2051 * inode locked, so we look to see if the glock is already locked and only
2052 * lock the glock if its not already been done. Note that its the NFS
2053 * readdirplus operation which causes this to be called (from filldir)
2054 * with the glock already held.
2059 static int gfs2_getattr(struct mnt_idmap *idmap,
2060 const struct path *path, struct kstat *stat,
2061 u32 request_mask, unsigned int flags)
2063 struct inode *inode = d_inode(path->dentry);
2064 struct gfs2_inode *ip = GFS2_I(inode);
2065 struct gfs2_holder gh;
2069 gfs2_holder_mark_uninitialized(&gh);
2070 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
2071 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
2076 gfsflags = ip->i_diskflags;
2077 if (gfsflags & GFS2_DIF_APPENDONLY)
2078 stat->attributes |= STATX_ATTR_APPEND;
2079 if (gfsflags & GFS2_DIF_IMMUTABLE)
2080 stat->attributes |= STATX_ATTR_IMMUTABLE;
2082 stat->attributes_mask |= (STATX_ATTR_APPEND |
2083 STATX_ATTR_COMPRESSED |
2084 STATX_ATTR_ENCRYPTED |
2085 STATX_ATTR_IMMUTABLE |
2088 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
2090 if (gfs2_holder_initialized(&gh))
2091 gfs2_glock_dq_uninit(&gh);
2096 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2099 struct gfs2_inode *ip = GFS2_I(inode);
2100 struct gfs2_holder gh;
2103 inode_lock_shared(inode);
2105 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2109 ret = iomap_fiemap(inode, fieinfo, start, len, &gfs2_iomap_ops);
2111 gfs2_glock_dq_uninit(&gh);
2114 inode_unlock_shared(inode);
2118 loff_t gfs2_seek_data(struct file *file, loff_t offset)
2120 struct inode *inode = file->f_mapping->host;
2121 struct gfs2_inode *ip = GFS2_I(inode);
2122 struct gfs2_holder gh;
2125 inode_lock_shared(inode);
2126 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2128 ret = iomap_seek_data(inode, offset, &gfs2_iomap_ops);
2129 gfs2_glock_dq_uninit(&gh);
2130 inode_unlock_shared(inode);
2134 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2137 loff_t gfs2_seek_hole(struct file *file, loff_t offset)
2139 struct inode *inode = file->f_mapping->host;
2140 struct gfs2_inode *ip = GFS2_I(inode);
2141 struct gfs2_holder gh;
2144 inode_lock_shared(inode);
2145 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
2147 ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
2148 gfs2_glock_dq_uninit(&gh);
2149 inode_unlock_shared(inode);
2153 return vfs_setpos(file, ret, inode->i_sb->s_maxbytes);
2156 static int gfs2_update_time(struct inode *inode, int flags)
2158 struct gfs2_inode *ip = GFS2_I(inode);
2159 struct gfs2_glock *gl = ip->i_gl;
2160 struct gfs2_holder *gh;
2163 gh = gfs2_glock_is_locked_by_me(gl);
2164 if (gh && !gfs2_glock_is_held_excl(gl)) {
2166 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, gh);
2167 error = gfs2_glock_nq(gh);
2171 generic_update_time(inode, flags);
2175 static const struct inode_operations gfs2_file_iops = {
2176 .permission = gfs2_permission,
2177 .setattr = gfs2_setattr,
2178 .getattr = gfs2_getattr,
2179 .listxattr = gfs2_listxattr,
2180 .fiemap = gfs2_fiemap,
2181 .get_inode_acl = gfs2_get_acl,
2182 .set_acl = gfs2_set_acl,
2183 .update_time = gfs2_update_time,
2184 .fileattr_get = gfs2_fileattr_get,
2185 .fileattr_set = gfs2_fileattr_set,
2188 static const struct inode_operations gfs2_dir_iops = {
2189 .create = gfs2_create,
2190 .lookup = gfs2_lookup,
2192 .unlink = gfs2_unlink,
2193 .symlink = gfs2_symlink,
2194 .mkdir = gfs2_mkdir,
2195 .rmdir = gfs2_unlink,
2196 .mknod = gfs2_mknod,
2197 .rename = gfs2_rename2,
2198 .permission = gfs2_permission,
2199 .setattr = gfs2_setattr,
2200 .getattr = gfs2_getattr,
2201 .listxattr = gfs2_listxattr,
2202 .fiemap = gfs2_fiemap,
2203 .get_inode_acl = gfs2_get_acl,
2204 .set_acl = gfs2_set_acl,
2205 .update_time = gfs2_update_time,
2206 .atomic_open = gfs2_atomic_open,
2207 .fileattr_get = gfs2_fileattr_get,
2208 .fileattr_set = gfs2_fileattr_set,
2211 static const struct inode_operations gfs2_symlink_iops = {
2212 .get_link = gfs2_get_link,
2213 .permission = gfs2_permission,
2214 .setattr = gfs2_setattr,
2215 .getattr = gfs2_getattr,
2216 .listxattr = gfs2_listxattr,
2217 .fiemap = gfs2_fiemap,