1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) International Business Machines Corp., 2000-2004
4 * Portions Copyright (C) Christoph Hellwig, 2001-2002
8 #include <linux/namei.h>
9 #include <linux/ctype.h>
10 #include <linux/quotaops.h>
11 #include <linux/exportfs.h>
12 #include "jfs_incore.h"
13 #include "jfs_superblock.h"
14 #include "jfs_inode.h"
15 #include "jfs_dinode.h"
17 #include "jfs_unicode.h"
18 #include "jfs_metapage.h"
19 #include "jfs_xattr.h"
21 #include "jfs_debug.h"
26 const struct dentry_operations jfs_ci_dentry_operations;
28 static s64 commitZeroLink(tid_t, struct inode *);
31 * NAME: free_ea_wmap(inode)
33 * FUNCTION: free uncommitted extended attributes from working map
36 static inline void free_ea_wmap(struct inode *inode)
38 dxd_t *ea = &JFS_IP(inode)->ea;
40 if (ea->flag & DXD_EXTENT) {
41 /* free EA pages from cache */
42 invalidate_dxd_metapages(inode, *ea);
43 dbFree(inode, addressDXD(ea), lengthDXD(ea));
49 * NAME: jfs_create(dip, dentry, mode)
51 * FUNCTION: create a regular file in the parent directory <dip>
52 * with name = <from dentry> and mode = <mode>
54 * PARAMETER: dip - parent directory vnode
55 * dentry - dentry of new file
56 * mode - create mode (rwxrwxrwx).
59 * RETURN: Errors from subroutines
62 static int jfs_create(struct inode *dip, struct dentry *dentry, umode_t mode,
66 tid_t tid; /* transaction id */
67 struct inode *ip = NULL; /* child directory inode */
69 struct component_name dname; /* child directory name */
70 struct btstack btstack;
71 struct inode *iplist[2];
74 jfs_info("jfs_create: dip:0x%p name:%pd", dip, dentry);
76 rc = dquot_initialize(dip);
81 * search parent directory for entry/freespace
82 * (dtSearch() returns parent directory page pinned)
84 if ((rc = get_UCSname(&dname, dentry)))
88 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
89 * block there while holding dtree page, so we allocate the inode &
90 * begin the transaction before we search the directory.
92 ip = ialloc(dip, mode);
98 tid = txBegin(dip->i_sb, 0);
100 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
101 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
103 rc = jfs_init_acl(tid, ip, dip);
107 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
113 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
114 jfs_err("jfs_create: dtSearch returned %d", rc);
119 tblk = tid_to_tblock(tid);
120 tblk->xflag |= COMMIT_CREATE;
121 tblk->ino = ip->i_ino;
122 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
128 * initialize the child XAD tree root in-line in inode
133 * create entry in parent directory for child directory
134 * (dtInsert() releases parent directory page)
137 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
139 jfs_err("jfs_create: dtInsert returned -EIO");
140 txAbort(tid, 1); /* Marks Filesystem dirty */
142 txAbort(tid, 0); /* Filesystem full */
146 ip->i_op = &jfs_file_inode_operations;
147 ip->i_fop = &jfs_file_operations;
148 ip->i_mapping->a_ops = &jfs_aops;
150 mark_inode_dirty(ip);
152 dip->i_ctime = dip->i_mtime = current_time(dip);
154 mark_inode_dirty(dip);
156 rc = txCommit(tid, 2, &iplist[0], 0);
160 mutex_unlock(&JFS_IP(ip)->commit_mutex);
161 mutex_unlock(&JFS_IP(dip)->commit_mutex);
165 discard_new_inode(ip);
167 d_instantiate_new(dentry, ip);
171 free_UCSname(&dname);
175 jfs_info("jfs_create: rc:%d", rc);
181 * NAME: jfs_mkdir(dip, dentry, mode)
183 * FUNCTION: create a child directory in the parent directory <dip>
184 * with name = <from dentry> and mode = <mode>
186 * PARAMETER: dip - parent directory vnode
187 * dentry - dentry of child directory
188 * mode - create mode (rwxrwxrwx).
190 * RETURN: Errors from subroutines
193 * EACCES: user needs search+write permission on the parent directory
195 static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
198 tid_t tid; /* transaction id */
199 struct inode *ip = NULL; /* child directory inode */
201 struct component_name dname; /* child directory name */
202 struct btstack btstack;
203 struct inode *iplist[2];
206 jfs_info("jfs_mkdir: dip:0x%p name:%pd", dip, dentry);
208 rc = dquot_initialize(dip);
213 * search parent directory for entry/freespace
214 * (dtSearch() returns parent directory page pinned)
216 if ((rc = get_UCSname(&dname, dentry)))
220 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
221 * block there while holding dtree page, so we allocate the inode &
222 * begin the transaction before we search the directory.
224 ip = ialloc(dip, S_IFDIR | mode);
230 tid = txBegin(dip->i_sb, 0);
232 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
233 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
235 rc = jfs_init_acl(tid, ip, dip);
239 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
245 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
246 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
251 tblk = tid_to_tblock(tid);
252 tblk->xflag |= COMMIT_CREATE;
253 tblk->ino = ip->i_ino;
254 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
260 * initialize the child directory in-line in inode
262 dtInitRoot(tid, ip, dip->i_ino);
265 * create entry in parent directory for child directory
266 * (dtInsert() releases parent directory page)
269 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
271 jfs_err("jfs_mkdir: dtInsert returned -EIO");
272 txAbort(tid, 1); /* Marks Filesystem dirty */
274 txAbort(tid, 0); /* Filesystem full */
278 set_nlink(ip, 2); /* for '.' */
279 ip->i_op = &jfs_dir_inode_operations;
280 ip->i_fop = &jfs_dir_operations;
282 mark_inode_dirty(ip);
284 /* update parent directory inode */
285 inc_nlink(dip); /* for '..' from child directory */
286 dip->i_ctime = dip->i_mtime = current_time(dip);
287 mark_inode_dirty(dip);
289 rc = txCommit(tid, 2, &iplist[0], 0);
293 mutex_unlock(&JFS_IP(ip)->commit_mutex);
294 mutex_unlock(&JFS_IP(dip)->commit_mutex);
298 discard_new_inode(ip);
300 d_instantiate_new(dentry, ip);
304 free_UCSname(&dname);
309 jfs_info("jfs_mkdir: rc:%d", rc);
314 * NAME: jfs_rmdir(dip, dentry)
316 * FUNCTION: remove a link to child directory
318 * PARAMETER: dip - parent inode
319 * dentry - child directory dentry
321 * RETURN: -EINVAL - if name is . or ..
322 * -EINVAL - if . or .. exist but are invalid.
323 * errors from subroutines
326 * if other threads have the directory open when the last link
327 * is removed, the "." and ".." entries, if present, are removed before
328 * rmdir() returns and no new entries may be created in the directory,
329 * but the directory is not removed until the last reference to
330 * the directory is released (cf.unlink() of regular file).
332 static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
335 tid_t tid; /* transaction id */
336 struct inode *ip = d_inode(dentry);
338 struct component_name dname;
339 struct inode *iplist[2];
342 jfs_info("jfs_rmdir: dip:0x%p name:%pd", dip, dentry);
344 /* Init inode for quota operations. */
345 rc = dquot_initialize(dip);
348 rc = dquot_initialize(ip);
352 /* directory must be empty to be removed */
358 if ((rc = get_UCSname(&dname, dentry))) {
362 tid = txBegin(dip->i_sb, 0);
364 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
365 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
370 tblk = tid_to_tblock(tid);
371 tblk->xflag |= COMMIT_DELETE;
375 * delete the entry of target directory from parent directory
378 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
379 jfs_err("jfs_rmdir: dtDelete returned %d", rc);
383 mutex_unlock(&JFS_IP(ip)->commit_mutex);
384 mutex_unlock(&JFS_IP(dip)->commit_mutex);
389 /* update parent directory's link count corresponding
390 * to ".." entry of the target directory deleted
392 dip->i_ctime = dip->i_mtime = current_time(dip);
393 inode_dec_link_count(dip);
396 * OS/2 could have created EA and/or ACL
398 /* free EA from both persistent and working map */
399 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
401 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
403 JFS_IP(ip)->ea.flag = 0;
405 /* free ACL from both persistent and working map */
406 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
408 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
410 JFS_IP(ip)->acl.flag = 0;
412 /* mark the target directory as deleted */
414 mark_inode_dirty(ip);
416 rc = txCommit(tid, 2, &iplist[0], 0);
420 mutex_unlock(&JFS_IP(ip)->commit_mutex);
421 mutex_unlock(&JFS_IP(dip)->commit_mutex);
424 * Truncating the directory index table is not guaranteed. It
425 * may need to be done iteratively
427 if (test_cflag(COMMIT_Stale, dip)) {
429 jfs_truncate_nolock(dip, 0);
431 clear_cflag(COMMIT_Stale, dip);
435 free_UCSname(&dname);
438 jfs_info("jfs_rmdir: rc:%d", rc);
443 * NAME: jfs_unlink(dip, dentry)
445 * FUNCTION: remove a link to object <vp> named by <name>
446 * from parent directory <dvp>
448 * PARAMETER: dip - inode of parent directory
449 * dentry - dentry of object to be removed
451 * RETURN: errors from subroutines
454 * temporary file: if one or more processes have the file open
455 * when the last link is removed, the link will be removed before
456 * unlink() returns, but the removal of the file contents will be
457 * postponed until all references to the files are closed.
459 * JFS does NOT support unlink() on directories.
462 static int jfs_unlink(struct inode *dip, struct dentry *dentry)
465 tid_t tid; /* transaction id */
466 struct inode *ip = d_inode(dentry);
468 struct component_name dname; /* object name */
469 struct inode *iplist[2];
474 jfs_info("jfs_unlink: dip:0x%p name:%pd", dip, dentry);
476 /* Init inode for quota operations. */
477 rc = dquot_initialize(dip);
480 rc = dquot_initialize(ip);
484 if ((rc = get_UCSname(&dname, dentry)))
487 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
489 tid = txBegin(dip->i_sb, 0);
491 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
492 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
498 * delete the entry of target file from parent directory
501 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
502 jfs_err("jfs_unlink: dtDelete returned %d", rc);
504 txAbort(tid, 1); /* Marks FS Dirty */
506 mutex_unlock(&JFS_IP(ip)->commit_mutex);
507 mutex_unlock(&JFS_IP(dip)->commit_mutex);
514 ip->i_ctime = dip->i_ctime = dip->i_mtime = current_time(ip);
515 mark_inode_dirty(dip);
517 /* update target's inode */
518 inode_dec_link_count(ip);
521 * commit zero link count object
523 if (ip->i_nlink == 0) {
524 assert(!test_cflag(COMMIT_Nolink, ip));
525 /* free block resources */
526 if ((new_size = commitZeroLink(tid, ip)) < 0) {
527 txAbort(tid, 1); /* Marks FS Dirty */
529 mutex_unlock(&JFS_IP(ip)->commit_mutex);
530 mutex_unlock(&JFS_IP(dip)->commit_mutex);
535 tblk = tid_to_tblock(tid);
536 tblk->xflag |= COMMIT_DELETE;
541 * Incomplete truncate of file data can
542 * result in timing problems unless we synchronously commit the
546 commit_flag = COMMIT_SYNC;
551 * If xtTruncate was incomplete, commit synchronously to avoid
552 * timing complications
554 rc = txCommit(tid, 2, &iplist[0], commit_flag);
558 mutex_unlock(&JFS_IP(ip)->commit_mutex);
559 mutex_unlock(&JFS_IP(dip)->commit_mutex);
561 while (new_size && (rc == 0)) {
562 tid = txBegin(dip->i_sb, 0);
563 mutex_lock(&JFS_IP(ip)->commit_mutex);
564 new_size = xtTruncate_pmap(tid, ip, new_size);
566 txAbort(tid, 1); /* Marks FS Dirty */
569 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
571 mutex_unlock(&JFS_IP(ip)->commit_mutex);
574 if (ip->i_nlink == 0)
575 set_cflag(COMMIT_Nolink, ip);
580 * Truncating the directory index table is not guaranteed. It
581 * may need to be done iteratively
583 if (test_cflag(COMMIT_Stale, dip)) {
585 jfs_truncate_nolock(dip, 0);
587 clear_cflag(COMMIT_Stale, dip);
591 free_UCSname(&dname);
593 jfs_info("jfs_unlink: rc:%d", rc);
598 * NAME: commitZeroLink()
600 * FUNCTION: for non-directory, called by jfs_remove(),
601 * truncate a regular file, directory or symbolic
602 * link to zero length. return 0 if type is not
605 * if the file is currently associated with a VM segment
606 * only permanent disk and inode map resources are freed,
607 * and neither the inode nor indirect blocks are modified
608 * so that the resources can be later freed in the work
610 * if there is no VM segment on entry, the resources are
611 * freed in both work and permanent map.
612 * (? for temporary file - memory object is cached even
613 * after no reference:
614 * reference count > 0 - )
616 * PARAMETERS: cd - pointer to commit data structure.
617 * current inode is the one to truncate.
619 * RETURN: Errors from subroutines
621 static s64 commitZeroLink(tid_t tid, struct inode *ip)
626 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
628 filetype = ip->i_mode & S_IFMT;
633 /* fast symbolic link */
634 if (ip->i_size < IDATASIZE) {
640 assert(filetype != S_IFDIR);
644 set_cflag(COMMIT_Freewmap, ip);
646 /* mark transaction of block map update type */
647 tblk = tid_to_tblock(tid);
648 tblk->xflag |= COMMIT_PMAP;
653 if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
654 /* acquire maplock on EA to be freed from block map */
655 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
660 if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
661 /* acquire maplock on EA to be freed from block map */
662 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
665 * free xtree/data (truncate to zero length):
666 * free xtree/data pages from cache if COMMIT_PWMAP,
667 * free xtree/data blocks from persistent block map, and
668 * free xtree/data blocks from working block map if COMMIT_PWMAP;
671 return xtTruncate_pmap(tid, ip, 0);
678 * NAME: jfs_free_zero_link()
680 * FUNCTION: for non-directory, called by iClose(),
681 * free resources of a file from cache and WORKING map
682 * for a file previously committed with zero link count
683 * while associated with a pager object,
685 * PARAMETER: ip - pointer to inode of file.
687 void jfs_free_zero_link(struct inode *ip)
691 jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
693 /* return if not reg or symbolic link or if size is
696 type = ip->i_mode & S_IFMT;
702 /* if its contained in inode nothing to do */
703 if (ip->i_size < IDATASIZE)
713 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
714 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
715 int xlen = lengthDXD(&JFS_IP(ip)->ea);
716 struct maplock maplock; /* maplock for COMMIT_WMAP */
717 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
719 /* free EA pages from cache */
720 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
722 /* free EA extent from working block map */
724 pxdlock = (struct pxd_lock *) & maplock;
725 pxdlock->flag = mlckFREEPXD;
726 PXDaddress(&pxdlock->pxd, xaddr);
727 PXDlength(&pxdlock->pxd, xlen);
728 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
734 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
735 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
736 int xlen = lengthDXD(&JFS_IP(ip)->acl);
737 struct maplock maplock; /* maplock for COMMIT_WMAP */
738 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
740 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
742 /* free ACL extent from working block map */
744 pxdlock = (struct pxd_lock *) & maplock;
745 pxdlock->flag = mlckFREEPXD;
746 PXDaddress(&pxdlock->pxd, xaddr);
747 PXDlength(&pxdlock->pxd, xlen);
748 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
752 * free xtree/data (truncate to zero length):
753 * free xtree/data pages from cache, and
754 * free xtree/data blocks from working block map;
757 xtTruncate(0, ip, 0, COMMIT_WMAP);
761 * NAME: jfs_link(vp, dvp, name, crp)
763 * FUNCTION: create a link to <vp> by the name = <name>
764 * in the parent directory <dvp>
766 * PARAMETER: vp - target object
767 * dvp - parent directory of new link
768 * name - name of new link to target object
771 * RETURN: Errors from subroutines
774 * JFS does NOT support link() on directories (to prevent circular
775 * path in the directory hierarchy);
776 * EPERM: the target object is a directory, and either the caller
777 * does not have appropriate privileges or the implementation prohibits
778 * using link() on directories [XPG4.2].
780 * JFS does NOT support links between file systems:
781 * EXDEV: target object and new link are on different file systems and
782 * implementation does not support links between file systems [XPG4.2].
784 static int jfs_link(struct dentry *old_dentry,
785 struct inode *dir, struct dentry *dentry)
789 struct inode *ip = d_inode(old_dentry);
791 struct component_name dname;
792 struct btstack btstack;
793 struct inode *iplist[2];
795 jfs_info("jfs_link: %pd %pd", old_dentry, dentry);
797 rc = dquot_initialize(dir);
801 tid = txBegin(ip->i_sb, 0);
803 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
804 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
807 * scan parent directory for entry/freespace
809 if ((rc = get_UCSname(&dname, dentry)))
812 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
816 * create entry for new link in parent directory
819 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
822 /* update object inode */
823 inc_nlink(ip); /* for new link */
824 ip->i_ctime = current_time(ip);
825 dir->i_ctime = dir->i_mtime = current_time(dir);
826 mark_inode_dirty(dir);
831 rc = txCommit(tid, 2, &iplist[0], 0);
834 drop_nlink(ip); /* never instantiated */
837 d_instantiate(dentry, ip);
840 free_UCSname(&dname);
845 mutex_unlock(&JFS_IP(ip)->commit_mutex);
846 mutex_unlock(&JFS_IP(dir)->commit_mutex);
849 jfs_info("jfs_link: rc:%d", rc);
854 * NAME: jfs_symlink(dip, dentry, name)
856 * FUNCTION: creates a symbolic link to <symlink> by name <name>
859 * PARAMETER: dip - parent directory vnode
860 * dentry - dentry of symbolic link
861 * name - the path name of the existing object
862 * that will be the source of the link
864 * RETURN: errors from subroutines
867 * ENAMETOOLONG: pathname resolution of a symbolic link produced
868 * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
871 static int jfs_symlink(struct inode *dip, struct dentry *dentry,
877 struct component_name dname;
878 int ssize; /* source pathname size */
879 struct btstack btstack;
880 struct inode *ip = d_inode(dentry);
882 int bmask = 0, xsize;
885 struct super_block *sb;
888 struct inode *iplist[2];
890 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
892 rc = dquot_initialize(dip);
896 ssize = strlen(name) + 1;
899 * search parent directory for entry/freespace
900 * (dtSearch() returns parent directory page pinned)
903 if ((rc = get_UCSname(&dname, dentry)))
907 * allocate on-disk/in-memory inode for symbolic link:
908 * (iAlloc() returns new, locked inode)
910 ip = ialloc(dip, S_IFLNK | 0777);
916 tid = txBegin(dip->i_sb, 0);
918 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
919 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
921 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
925 tblk = tid_to_tblock(tid);
926 tblk->xflag |= COMMIT_CREATE;
927 tblk->ino = ip->i_ino;
928 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
930 /* fix symlink access permission
931 * (dir_create() ANDs in the u.u_cmask,
932 * but symlinks really need to be 777 access)
937 * write symbolic link target path name
942 * write source path name inline in on-disk inode (fast symbolic link)
945 if (ssize <= IDATASIZE) {
946 ip->i_op = &jfs_fast_symlink_inode_operations;
948 ip->i_link = JFS_IP(ip)->i_inline;
949 memcpy(ip->i_link, name, ssize);
950 ip->i_size = ssize - 1;
953 * if symlink is > 128 bytes, we don't have the space to
954 * store inline extended attributes
956 if (ssize > sizeof (JFS_IP(ip)->i_inline))
957 JFS_IP(ip)->mode2 &= ~INLINEEA;
959 jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ",
963 * write source path name in a single extent
966 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
968 ip->i_op = &jfs_symlink_inode_operations;
970 ip->i_mapping->a_ops = &jfs_aops;
973 * even though the data of symlink object (source
974 * path name) is treated as non-journaled user data,
975 * it is read/written thru buffer cache for performance.
978 bmask = JFS_SBI(sb)->bsize - 1;
979 xsize = (ssize + bmask) & ~bmask;
981 xlen = xsize >> JFS_SBI(sb)->l2bsize;
982 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
986 ip->i_size = ssize - 1;
988 /* This is kind of silly since PATH_MAX == 4K */
989 int copy_size = min(ssize, PSIZE);
991 mp = get_metapage(ip, xaddr, PSIZE, 1);
994 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
999 memcpy(mp->data, name, copy_size);
1003 xaddr += JFS_SBI(sb)->nbperpage;
1008 * create entry for symbolic link in parent directory
1010 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1013 rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1017 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1019 /* discard new inode */
1023 mark_inode_dirty(ip);
1025 dip->i_ctime = dip->i_mtime = current_time(dip);
1026 mark_inode_dirty(dip);
1028 * commit update of parent directory and link object
1033 rc = txCommit(tid, 2, &iplist[0], 0);
1037 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1038 mutex_unlock(&JFS_IP(dip)->commit_mutex);
1042 discard_new_inode(ip);
1044 d_instantiate_new(dentry, ip);
1048 free_UCSname(&dname);
1051 jfs_info("jfs_symlink: rc:%d", rc);
1059 * FUNCTION: rename a file or directory
1061 static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1062 struct inode *new_dir, struct dentry *new_dentry,
1065 struct btstack btstack;
1067 struct component_name new_dname;
1068 struct inode *new_ip;
1069 struct component_name old_dname;
1070 struct inode *old_ip;
1074 struct dt_lock *dtlck;
1077 struct inode *iplist[4];
1078 struct tblock *tblk;
1082 if (flags & ~RENAME_NOREPLACE)
1085 jfs_info("jfs_rename: %pd %pd", old_dentry, new_dentry);
1087 rc = dquot_initialize(old_dir);
1090 rc = dquot_initialize(new_dir);
1094 old_ip = d_inode(old_dentry);
1095 new_ip = d_inode(new_dentry);
1097 if ((rc = get_UCSname(&old_dname, old_dentry)))
1100 if ((rc = get_UCSname(&new_dname, new_dentry)))
1104 * Make sure source inode number is what we think it is
1106 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1107 if (rc || (ino != old_ip->i_ino)) {
1113 * Make sure dest inode number (if any) is what we think it is
1115 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1117 if ((!new_ip) || (ino != new_ip->i_ino)) {
1121 } else if (rc != -ENOENT)
1124 /* no entry exists, but one was expected */
1129 if (S_ISDIR(old_ip->i_mode)) {
1131 if (!dtEmpty(new_ip)) {
1136 } else if (new_ip) {
1137 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
1138 /* Init inode for quota operations. */
1139 rc = dquot_initialize(new_ip);
1145 * The real work starts here
1147 tid = txBegin(new_dir->i_sb, 0);
1150 * How do we know the locking is safe from deadlocks?
1151 * The vfs does the hard part for us. Any time we are taking nested
1152 * commit_mutexes, the vfs already has i_mutex held on the parent.
1153 * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1155 mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1156 mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1157 if (old_dir != new_dir)
1158 mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1159 COMMIT_MUTEX_SECOND_PARENT);
1162 mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1163 COMMIT_MUTEX_VICTIM);
1165 * Change existing directory entry to new inode number
1167 ino = new_ip->i_ino;
1168 rc = dtModify(tid, new_dir, &new_dname, &ino,
1169 old_ip->i_ino, JFS_RENAME);
1173 if (S_ISDIR(new_ip->i_mode)) {
1175 if (new_ip->i_nlink) {
1176 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1177 if (old_dir != new_dir)
1178 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1179 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1180 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1181 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1182 IWRITE_UNLOCK(new_ip);
1183 jfs_error(new_ip->i_sb,
1184 "new_ip->i_nlink != 0\n");
1187 tblk = tid_to_tblock(tid);
1188 tblk->xflag |= COMMIT_DELETE;
1189 tblk->u.ip = new_ip;
1190 } else if (new_ip->i_nlink == 0) {
1191 assert(!test_cflag(COMMIT_Nolink, new_ip));
1192 /* free block resources */
1193 if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1194 txAbort(tid, 1); /* Marks FS Dirty */
1198 tblk = tid_to_tblock(tid);
1199 tblk->xflag |= COMMIT_DELETE;
1200 tblk->u.ip = new_ip;
1202 new_ip->i_ctime = current_time(new_ip);
1203 mark_inode_dirty(new_ip);
1207 * Add new directory entry
1209 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1212 jfs_err("jfs_rename didn't expect dtSearch to fail w/rc = %d",
1217 ino = old_ip->i_ino;
1218 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1221 jfs_err("jfs_rename: dtInsert returned -EIO");
1224 if (S_ISDIR(old_ip->i_mode))
1228 * Remove old directory entry
1231 ino = old_ip->i_ino;
1232 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1234 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1236 txAbort(tid, 1); /* Marks Filesystem dirty */
1239 if (S_ISDIR(old_ip->i_mode)) {
1240 drop_nlink(old_dir);
1241 if (old_dir != new_dir) {
1243 * Change inode number of parent for moved directory
1246 JFS_IP(old_ip)->i_dtroot.header.idotdot =
1247 cpu_to_le32(new_dir->i_ino);
1249 /* Linelock header of dtree */
1250 tlck = txLock(tid, old_ip,
1251 (struct metapage *) &JFS_IP(old_ip)->bxflag,
1252 tlckDTREE | tlckBTROOT | tlckRELINK);
1253 dtlck = (struct dt_lock *) & tlck->lock;
1254 ASSERT(dtlck->index == 0);
1255 lv = & dtlck->lv[0];
1263 * Update ctime on changed/moved inodes & mark dirty
1265 old_ip->i_ctime = current_time(old_ip);
1266 mark_inode_dirty(old_ip);
1268 new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1269 mark_inode_dirty(new_dir);
1271 /* Build list of inodes modified by this transaction */
1273 iplist[ipcount++] = old_ip;
1275 iplist[ipcount++] = new_ip;
1276 iplist[ipcount++] = old_dir;
1278 if (old_dir != new_dir) {
1279 iplist[ipcount++] = new_dir;
1280 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1281 mark_inode_dirty(old_dir);
1285 * Incomplete truncate of file data can
1286 * result in timing problems unless we synchronously commit the
1290 commit_flag = COMMIT_SYNC;
1294 rc = txCommit(tid, ipcount, iplist, commit_flag);
1299 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1300 if (old_dir != new_dir)
1301 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1302 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1303 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1305 while (new_size && (rc == 0)) {
1306 tid = txBegin(new_ip->i_sb, 0);
1307 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1308 new_size = xtTruncate_pmap(tid, new_ip, new_size);
1313 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1315 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1317 if (new_ip && (new_ip->i_nlink == 0))
1318 set_cflag(COMMIT_Nolink, new_ip);
1320 * Truncating the directory index table is not guaranteed. It
1321 * may need to be done iteratively
1323 if (test_cflag(COMMIT_Stale, old_dir)) {
1324 if (old_dir->i_size > 1)
1325 jfs_truncate_nolock(old_dir, 0);
1327 clear_cflag(COMMIT_Stale, old_dir);
1330 if (new_ip && !S_ISDIR(new_ip->i_mode))
1331 IWRITE_UNLOCK(new_ip);
1333 free_UCSname(&new_dname);
1335 free_UCSname(&old_dname);
1337 jfs_info("jfs_rename: returning %d", rc);
1345 * FUNCTION: Create a special file (device)
1347 static int jfs_mknod(struct inode *dir, struct dentry *dentry,
1348 umode_t mode, dev_t rdev)
1350 struct jfs_inode_info *jfs_ip;
1351 struct btstack btstack;
1352 struct component_name dname;
1355 struct inode *iplist[2];
1358 struct tblock *tblk;
1360 jfs_info("jfs_mknod: %pd", dentry);
1362 rc = dquot_initialize(dir);
1366 if ((rc = get_UCSname(&dname, dentry)))
1369 ip = ialloc(dir, mode);
1374 jfs_ip = JFS_IP(ip);
1376 tid = txBegin(dir->i_sb, 0);
1378 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1379 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1381 rc = jfs_init_acl(tid, ip, dir);
1385 rc = jfs_init_security(tid, ip, dir, &dentry->d_name);
1391 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1396 tblk = tid_to_tblock(tid);
1397 tblk->xflag |= COMMIT_CREATE;
1398 tblk->ino = ip->i_ino;
1399 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1402 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1407 ip->i_op = &jfs_file_inode_operations;
1408 jfs_ip->dev = new_encode_dev(rdev);
1409 init_special_inode(ip, ip->i_mode, rdev);
1411 mark_inode_dirty(ip);
1413 dir->i_ctime = dir->i_mtime = current_time(dir);
1415 mark_inode_dirty(dir);
1419 rc = txCommit(tid, 2, iplist, 0);
1423 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1424 mutex_unlock(&JFS_IP(dir)->commit_mutex);
1428 discard_new_inode(ip);
1430 d_instantiate_new(dentry, ip);
1434 free_UCSname(&dname);
1437 jfs_info("jfs_mknod: returning %d", rc);
1441 static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
1443 struct btstack btstack;
1446 struct component_name key;
1449 jfs_info("jfs_lookup: name = %pd", dentry);
1451 if ((rc = get_UCSname(&key, dentry)))
1453 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1455 if (rc == -ENOENT) {
1458 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1461 ip = jfs_iget(dip->i_sb, inum);
1463 jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum);
1466 return d_splice_alias(ip, dentry);
1469 static struct inode *jfs_nfs_get_inode(struct super_block *sb,
1470 u64 ino, u32 generation)
1472 struct inode *inode;
1475 return ERR_PTR(-ESTALE);
1476 inode = jfs_iget(sb, ino);
1478 return ERR_CAST(inode);
1480 if (generation && inode->i_generation != generation) {
1482 return ERR_PTR(-ESTALE);
1488 struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1489 int fh_len, int fh_type)
1491 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1495 struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1496 int fh_len, int fh_type)
1498 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1502 struct dentry *jfs_get_parent(struct dentry *dentry)
1504 unsigned long parent_ino;
1507 le32_to_cpu(JFS_IP(d_inode(dentry))->i_dtroot.header.idotdot);
1509 return d_obtain_alias(jfs_iget(dentry->d_sb, parent_ino));
1512 const struct inode_operations jfs_dir_inode_operations = {
1513 .create = jfs_create,
1514 .lookup = jfs_lookup,
1516 .unlink = jfs_unlink,
1517 .symlink = jfs_symlink,
1521 .rename = jfs_rename,
1522 .listxattr = jfs_listxattr,
1523 .setattr = jfs_setattr,
1524 #ifdef CONFIG_JFS_POSIX_ACL
1525 .get_acl = jfs_get_acl,
1526 .set_acl = jfs_set_acl,
1530 const struct file_operations jfs_dir_operations = {
1531 .read = generic_read_dir,
1532 .iterate = jfs_readdir,
1534 .unlocked_ioctl = jfs_ioctl,
1535 #ifdef CONFIG_COMPAT
1536 .compat_ioctl = jfs_compat_ioctl,
1538 .llseek = generic_file_llseek,
1541 static int jfs_ci_hash(const struct dentry *dir, struct qstr *this)
1546 hash = init_name_hash(dir);
1547 for (i=0; i < this->len; i++)
1548 hash = partial_name_hash(tolower(this->name[i]), hash);
1549 this->hash = end_name_hash(hash);
1554 static int jfs_ci_compare(const struct dentry *dentry,
1555 unsigned int len, const char *str, const struct qstr *name)
1559 if (len != name->len)
1561 for (i=0; i < len; i++) {
1562 if (tolower(str[i]) != tolower(name->name[i]))
1570 static int jfs_ci_revalidate(struct dentry *dentry, unsigned int flags)
1573 * This is not negative dentry. Always valid.
1575 * Note, rename() to existing directory entry will have ->d_inode,
1576 * and will use existing name which isn't specified name by user.
1578 * We may be able to drop this positive dentry here. But dropping
1579 * positive dentry isn't good idea. So it's unsupported like
1580 * rename("filename", "FILENAME") for now.
1582 if (d_really_is_positive(dentry))
1586 * This may be nfsd (or something), anyway, we can't see the
1587 * intent of this. So, since this can be for creation, drop it.
1593 * Drop the negative dentry, in order to make sure to use the
1594 * case sensitive name which is specified by user if this is
1597 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
1602 const struct dentry_operations jfs_ci_dentry_operations =
1604 .d_hash = jfs_ci_hash,
1605 .d_compare = jfs_ci_compare,
1606 .d_revalidate = jfs_ci_revalidate,