2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <linux/ctype.h>
22 #include <linux/quotaops.h>
23 #include <linux/exportfs.h>
24 #include "jfs_incore.h"
25 #include "jfs_superblock.h"
26 #include "jfs_inode.h"
27 #include "jfs_dinode.h"
29 #include "jfs_unicode.h"
30 #include "jfs_metapage.h"
31 #include "jfs_xattr.h"
33 #include "jfs_debug.h"
38 const struct dentry_operations jfs_ci_dentry_operations;
40 static s64 commitZeroLink(tid_t, struct inode *);
43 * NAME: free_ea_wmap(inode)
45 * FUNCTION: free uncommitted extended attributes from working map
48 static inline void free_ea_wmap(struct inode *inode)
50 dxd_t *ea = &JFS_IP(inode)->ea;
52 if (ea->flag & DXD_EXTENT) {
53 /* free EA pages from cache */
54 invalidate_dxd_metapages(inode, *ea);
55 dbFree(inode, addressDXD(ea), lengthDXD(ea));
61 * NAME: jfs_create(dip, dentry, mode)
63 * FUNCTION: create a regular file in the parent directory <dip>
64 * with name = <from dentry> and mode = <mode>
66 * PARAMETER: dip - parent directory vnode
67 * dentry - dentry of new file
68 * mode - create mode (rwxrwxrwx).
71 * RETURN: Errors from subroutines
74 static int jfs_create(struct inode *dip, struct dentry *dentry, int mode,
78 tid_t tid; /* transaction id */
79 struct inode *ip = NULL; /* child directory inode */
81 struct component_name dname; /* child directory name */
82 struct btstack btstack;
83 struct inode *iplist[2];
86 jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name);
89 * search parent directory for entry/freespace
90 * (dtSearch() returns parent directory page pinned)
92 if ((rc = get_UCSname(&dname, dentry)))
96 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
97 * block there while holding dtree page, so we allocate the inode &
98 * begin the transaction before we search the directory.
100 ip = ialloc(dip, mode);
106 tid = txBegin(dip->i_sb, 0);
108 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
109 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
111 rc = jfs_init_acl(tid, ip, dip);
115 rc = jfs_init_security(tid, ip, dip);
121 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
122 jfs_err("jfs_create: dtSearch returned %d", rc);
127 tblk = tid_to_tblock(tid);
128 tblk->xflag |= COMMIT_CREATE;
129 tblk->ino = ip->i_ino;
130 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
136 * initialize the child XAD tree root in-line in inode
141 * create entry in parent directory for child directory
142 * (dtInsert() releases parent directory page)
145 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
147 jfs_err("jfs_create: dtInsert returned -EIO");
148 txAbort(tid, 1); /* Marks Filesystem dirty */
150 txAbort(tid, 0); /* Filesystem full */
154 ip->i_op = &jfs_file_inode_operations;
155 ip->i_fop = &jfs_file_operations;
156 ip->i_mapping->a_ops = &jfs_aops;
158 mark_inode_dirty(ip);
160 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
162 mark_inode_dirty(dip);
164 rc = txCommit(tid, 2, &iplist[0], 0);
168 mutex_unlock(&JFS_IP(ip)->commit_mutex);
169 mutex_unlock(&JFS_IP(dip)->commit_mutex);
173 unlock_new_inode(ip);
176 d_instantiate(dentry, ip);
177 unlock_new_inode(ip);
181 free_UCSname(&dname);
185 jfs_info("jfs_create: rc:%d", rc);
191 * NAME: jfs_mkdir(dip, dentry, mode)
193 * FUNCTION: create a child directory in the parent directory <dip>
194 * with name = <from dentry> and mode = <mode>
196 * PARAMETER: dip - parent directory vnode
197 * dentry - dentry of child directory
198 * mode - create mode (rwxrwxrwx).
200 * RETURN: Errors from subroutines
203 * EACCESS: user needs search+write permission on the parent directory
205 static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode)
208 tid_t tid; /* transaction id */
209 struct inode *ip = NULL; /* child directory inode */
211 struct component_name dname; /* child directory name */
212 struct btstack btstack;
213 struct inode *iplist[2];
216 jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name);
218 /* link count overflow on parent directory ? */
219 if (dip->i_nlink == JFS_LINK_MAX) {
225 * search parent directory for entry/freespace
226 * (dtSearch() returns parent directory page pinned)
228 if ((rc = get_UCSname(&dname, dentry)))
232 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
233 * block there while holding dtree page, so we allocate the inode &
234 * begin the transaction before we search the directory.
236 ip = ialloc(dip, S_IFDIR | mode);
242 tid = txBegin(dip->i_sb, 0);
244 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
245 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
247 rc = jfs_init_acl(tid, ip, dip);
251 rc = jfs_init_security(tid, ip, dip);
257 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
258 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
263 tblk = tid_to_tblock(tid);
264 tblk->xflag |= COMMIT_CREATE;
265 tblk->ino = ip->i_ino;
266 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
272 * initialize the child directory in-line in inode
274 dtInitRoot(tid, ip, dip->i_ino);
277 * create entry in parent directory for child directory
278 * (dtInsert() releases parent directory page)
281 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
283 jfs_err("jfs_mkdir: dtInsert returned -EIO");
284 txAbort(tid, 1); /* Marks Filesystem dirty */
286 txAbort(tid, 0); /* Filesystem full */
290 ip->i_nlink = 2; /* for '.' */
291 ip->i_op = &jfs_dir_inode_operations;
292 ip->i_fop = &jfs_dir_operations;
294 mark_inode_dirty(ip);
296 /* update parent directory inode */
297 inc_nlink(dip); /* for '..' from child directory */
298 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
299 mark_inode_dirty(dip);
301 rc = txCommit(tid, 2, &iplist[0], 0);
305 mutex_unlock(&JFS_IP(ip)->commit_mutex);
306 mutex_unlock(&JFS_IP(dip)->commit_mutex);
310 unlock_new_inode(ip);
313 d_instantiate(dentry, ip);
314 unlock_new_inode(ip);
318 free_UCSname(&dname);
323 jfs_info("jfs_mkdir: rc:%d", rc);
328 * NAME: jfs_rmdir(dip, dentry)
330 * FUNCTION: remove a link to child directory
332 * PARAMETER: dip - parent inode
333 * dentry - child directory dentry
335 * RETURN: -EINVAL - if name is . or ..
336 * -EINVAL - if . or .. exist but are invalid.
337 * errors from subroutines
340 * if other threads have the directory open when the last link
341 * is removed, the "." and ".." entries, if present, are removed before
342 * rmdir() returns and no new entries may be created in the directory,
343 * but the directory is not removed until the last reference to
344 * the directory is released (cf.unlink() of regular file).
346 static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
349 tid_t tid; /* transaction id */
350 struct inode *ip = dentry->d_inode;
352 struct component_name dname;
353 struct inode *iplist[2];
356 jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name);
358 /* Init inode for quota operations. */
361 /* directory must be empty to be removed */
367 if ((rc = get_UCSname(&dname, dentry))) {
371 tid = txBegin(dip->i_sb, 0);
373 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
374 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
379 tblk = tid_to_tblock(tid);
380 tblk->xflag |= COMMIT_DELETE;
384 * delete the entry of target directory from parent directory
387 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
388 jfs_err("jfs_rmdir: dtDelete returned %d", rc);
392 mutex_unlock(&JFS_IP(ip)->commit_mutex);
393 mutex_unlock(&JFS_IP(dip)->commit_mutex);
398 /* update parent directory's link count corresponding
399 * to ".." entry of the target directory deleted
401 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
402 inode_dec_link_count(dip);
405 * OS/2 could have created EA and/or ACL
407 /* free EA from both persistent and working map */
408 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
410 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
412 JFS_IP(ip)->ea.flag = 0;
414 /* free ACL from both persistent and working map */
415 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
417 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
419 JFS_IP(ip)->acl.flag = 0;
421 /* mark the target directory as deleted */
423 mark_inode_dirty(ip);
425 rc = txCommit(tid, 2, &iplist[0], 0);
429 mutex_unlock(&JFS_IP(ip)->commit_mutex);
430 mutex_unlock(&JFS_IP(dip)->commit_mutex);
433 * Truncating the directory index table is not guaranteed. It
434 * may need to be done iteratively
436 if (test_cflag(COMMIT_Stale, dip)) {
438 jfs_truncate_nolock(dip, 0);
440 clear_cflag(COMMIT_Stale, dip);
444 free_UCSname(&dname);
447 jfs_info("jfs_rmdir: rc:%d", rc);
452 * NAME: jfs_unlink(dip, dentry)
454 * FUNCTION: remove a link to object <vp> named by <name>
455 * from parent directory <dvp>
457 * PARAMETER: dip - inode of parent directory
458 * dentry - dentry of object to be removed
460 * RETURN: errors from subroutines
463 * temporary file: if one or more processes have the file open
464 * when the last link is removed, the link will be removed before
465 * unlink() returns, but the removal of the file contents will be
466 * postponed until all references to the files are closed.
468 * JFS does NOT support unlink() on directories.
471 static int jfs_unlink(struct inode *dip, struct dentry *dentry)
474 tid_t tid; /* transaction id */
475 struct inode *ip = dentry->d_inode;
477 struct component_name dname; /* object name */
478 struct inode *iplist[2];
483 jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name);
485 /* Init inode for quota operations. */
488 if ((rc = get_UCSname(&dname, dentry)))
491 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
493 tid = txBegin(dip->i_sb, 0);
495 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
496 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
502 * delete the entry of target file from parent directory
505 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
506 jfs_err("jfs_unlink: dtDelete returned %d", rc);
508 txAbort(tid, 1); /* Marks FS Dirty */
510 mutex_unlock(&JFS_IP(ip)->commit_mutex);
511 mutex_unlock(&JFS_IP(dip)->commit_mutex);
518 ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME;
519 mark_inode_dirty(dip);
521 /* update target's inode */
522 inode_dec_link_count(ip);
525 * commit zero link count object
527 if (ip->i_nlink == 0) {
528 assert(!test_cflag(COMMIT_Nolink, ip));
529 /* free block resources */
530 if ((new_size = commitZeroLink(tid, ip)) < 0) {
531 txAbort(tid, 1); /* Marks FS Dirty */
533 mutex_unlock(&JFS_IP(ip)->commit_mutex);
534 mutex_unlock(&JFS_IP(dip)->commit_mutex);
539 tblk = tid_to_tblock(tid);
540 tblk->xflag |= COMMIT_DELETE;
545 * Incomplete truncate of file data can
546 * result in timing problems unless we synchronously commit the
550 commit_flag = COMMIT_SYNC;
555 * If xtTruncate was incomplete, commit synchronously to avoid
556 * timing complications
558 rc = txCommit(tid, 2, &iplist[0], commit_flag);
562 mutex_unlock(&JFS_IP(ip)->commit_mutex);
563 mutex_unlock(&JFS_IP(dip)->commit_mutex);
565 while (new_size && (rc == 0)) {
566 tid = txBegin(dip->i_sb, 0);
567 mutex_lock(&JFS_IP(ip)->commit_mutex);
568 new_size = xtTruncate_pmap(tid, ip, new_size);
570 txAbort(tid, 1); /* Marks FS Dirty */
573 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
575 mutex_unlock(&JFS_IP(ip)->commit_mutex);
578 if (ip->i_nlink == 0)
579 set_cflag(COMMIT_Nolink, ip);
584 * Truncating the directory index table is not guaranteed. It
585 * may need to be done iteratively
587 if (test_cflag(COMMIT_Stale, dip)) {
589 jfs_truncate_nolock(dip, 0);
591 clear_cflag(COMMIT_Stale, dip);
595 free_UCSname(&dname);
597 jfs_info("jfs_unlink: rc:%d", rc);
602 * NAME: commitZeroLink()
604 * FUNCTION: for non-directory, called by jfs_remove(),
605 * truncate a regular file, directory or symbolic
606 * link to zero length. return 0 if type is not
609 * if the file is currently associated with a VM segment
610 * only permanent disk and inode map resources are freed,
611 * and neither the inode nor indirect blocks are modified
612 * so that the resources can be later freed in the work
614 * if there is no VM segment on entry, the resources are
615 * freed in both work and permanent map.
616 * (? for temporary file - memory object is cached even
617 * after no reference:
618 * reference count > 0 - )
620 * PARAMETERS: cd - pointer to commit data structure.
621 * current inode is the one to truncate.
623 * RETURN: Errors from subroutines
625 static s64 commitZeroLink(tid_t tid, struct inode *ip)
630 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
632 filetype = ip->i_mode & S_IFMT;
637 /* fast symbolic link */
638 if (ip->i_size < IDATASIZE) {
644 assert(filetype != S_IFDIR);
648 set_cflag(COMMIT_Freewmap, ip);
650 /* mark transaction of block map update type */
651 tblk = tid_to_tblock(tid);
652 tblk->xflag |= COMMIT_PMAP;
657 if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
658 /* acquire maplock on EA to be freed from block map */
659 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
664 if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
665 /* acquire maplock on EA to be freed from block map */
666 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
669 * free xtree/data (truncate to zero length):
670 * free xtree/data pages from cache if COMMIT_PWMAP,
671 * free xtree/data blocks from persistent block map, and
672 * free xtree/data blocks from working block map if COMMIT_PWMAP;
675 return xtTruncate_pmap(tid, ip, 0);
682 * NAME: jfs_free_zero_link()
684 * FUNCTION: for non-directory, called by iClose(),
685 * free resources of a file from cache and WORKING map
686 * for a file previously committed with zero link count
687 * while associated with a pager object,
689 * PARAMETER: ip - pointer to inode of file.
691 void jfs_free_zero_link(struct inode *ip)
695 jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
697 /* return if not reg or symbolic link or if size is
700 type = ip->i_mode & S_IFMT;
706 /* if its contained in inode nothing to do */
707 if (ip->i_size < IDATASIZE)
717 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
718 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
719 int xlen = lengthDXD(&JFS_IP(ip)->ea);
720 struct maplock maplock; /* maplock for COMMIT_WMAP */
721 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
723 /* free EA pages from cache */
724 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
726 /* free EA extent from working block map */
728 pxdlock = (struct pxd_lock *) & maplock;
729 pxdlock->flag = mlckFREEPXD;
730 PXDaddress(&pxdlock->pxd, xaddr);
731 PXDlength(&pxdlock->pxd, xlen);
732 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
738 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
739 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
740 int xlen = lengthDXD(&JFS_IP(ip)->acl);
741 struct maplock maplock; /* maplock for COMMIT_WMAP */
742 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
744 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
746 /* free ACL extent from working block map */
748 pxdlock = (struct pxd_lock *) & maplock;
749 pxdlock->flag = mlckFREEPXD;
750 PXDaddress(&pxdlock->pxd, xaddr);
751 PXDlength(&pxdlock->pxd, xlen);
752 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
756 * free xtree/data (truncate to zero length):
757 * free xtree/data pages from cache, and
758 * free xtree/data blocks from working block map;
761 xtTruncate(0, ip, 0, COMMIT_WMAP);
765 * NAME: jfs_link(vp, dvp, name, crp)
767 * FUNCTION: create a link to <vp> by the name = <name>
768 * in the parent directory <dvp>
770 * PARAMETER: vp - target object
771 * dvp - parent directory of new link
772 * name - name of new link to target object
775 * RETURN: Errors from subroutines
778 * JFS does NOT support link() on directories (to prevent circular
779 * path in the directory hierarchy);
780 * EPERM: the target object is a directory, and either the caller
781 * does not have appropriate privileges or the implementation prohibits
782 * using link() on directories [XPG4.2].
784 * JFS does NOT support links between file systems:
785 * EXDEV: target object and new link are on different file systems and
786 * implementation does not support links between file systems [XPG4.2].
788 static int jfs_link(struct dentry *old_dentry,
789 struct inode *dir, struct dentry *dentry)
793 struct inode *ip = old_dentry->d_inode;
795 struct component_name dname;
796 struct btstack btstack;
797 struct inode *iplist[2];
799 jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
800 dentry->d_name.name);
802 if (ip->i_nlink == JFS_LINK_MAX)
805 if (ip->i_nlink == 0)
808 tid = txBegin(ip->i_sb, 0);
810 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
811 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
814 * scan parent directory for entry/freespace
816 if ((rc = get_UCSname(&dname, dentry)))
819 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
823 * create entry for new link in parent directory
826 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
829 /* update object inode */
830 inc_nlink(ip); /* for new link */
831 ip->i_ctime = CURRENT_TIME;
832 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
833 mark_inode_dirty(dir);
834 atomic_inc(&ip->i_count);
838 rc = txCommit(tid, 2, &iplist[0], 0);
841 ip->i_nlink--; /* never instantiated */
844 d_instantiate(dentry, ip);
847 free_UCSname(&dname);
852 mutex_unlock(&JFS_IP(ip)->commit_mutex);
853 mutex_unlock(&JFS_IP(dir)->commit_mutex);
855 jfs_info("jfs_link: rc:%d", rc);
860 * NAME: jfs_symlink(dip, dentry, name)
862 * FUNCTION: creates a symbolic link to <symlink> by name <name>
865 * PARAMETER: dip - parent directory vnode
866 * dentry - dentry of symbolic link
867 * name - the path name of the existing object
868 * that will be the source of the link
870 * RETURN: errors from subroutines
873 * ENAMETOOLONG: pathname resolution of a symbolic link produced
874 * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
877 static int jfs_symlink(struct inode *dip, struct dentry *dentry,
883 struct component_name dname;
884 int ssize; /* source pathname size */
885 struct btstack btstack;
886 struct inode *ip = dentry->d_inode;
887 unchar *i_fastsymlink;
889 int bmask = 0, xsize;
890 s64 extent = 0, xaddr;
892 struct super_block *sb;
895 struct inode *iplist[2];
897 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
899 ssize = strlen(name) + 1;
902 * search parent directory for entry/freespace
903 * (dtSearch() returns parent directory page pinned)
906 if ((rc = get_UCSname(&dname, dentry)))
910 * allocate on-disk/in-memory inode for symbolic link:
911 * (iAlloc() returns new, locked inode)
913 ip = ialloc(dip, S_IFLNK | 0777);
919 tid = txBegin(dip->i_sb, 0);
921 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
922 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
924 rc = jfs_init_security(tid, ip, dip);
928 tblk = tid_to_tblock(tid);
929 tblk->xflag |= COMMIT_CREATE;
930 tblk->ino = ip->i_ino;
931 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
933 /* fix symlink access permission
934 * (dir_create() ANDs in the u.u_cmask,
935 * but symlinks really need to be 777 access)
940 * write symbolic link target path name
945 * write source path name inline in on-disk inode (fast symbolic link)
948 if (ssize <= IDATASIZE) {
949 ip->i_op = &jfs_symlink_inode_operations;
951 i_fastsymlink = JFS_IP(ip)->i_inline;
952 memcpy(i_fastsymlink, name, ssize);
953 ip->i_size = ssize - 1;
956 * if symlink is > 128 bytes, we don't have the space to
957 * store inline extended attributes
959 if (ssize > sizeof (JFS_IP(ip)->i_inline))
960 JFS_IP(ip)->mode2 &= ~INLINEEA;
962 jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ",
966 * write source path name in a single extent
969 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
971 ip->i_op = &page_symlink_inode_operations;
972 ip->i_mapping->a_ops = &jfs_aops;
975 * even though the data of symlink object (source
976 * path name) is treated as non-journaled user data,
977 * it is read/written thru buffer cache for performance.
980 bmask = JFS_SBI(sb)->bsize - 1;
981 xsize = (ssize + bmask) & ~bmask;
983 xlen = xsize >> JFS_SBI(sb)->l2bsize;
984 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
989 ip->i_size = ssize - 1;
991 /* This is kind of silly since PATH_MAX == 4K */
992 int copy_size = min(ssize, PSIZE);
994 mp = get_metapage(ip, xaddr, PSIZE, 1);
997 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1002 memcpy(mp->data, name, copy_size);
1006 xaddr += JFS_SBI(sb)->nbperpage;
1011 * create entry for symbolic link in parent directory
1013 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1016 rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1020 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1022 /* discard new inode */
1026 mark_inode_dirty(ip);
1028 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
1029 mark_inode_dirty(dip);
1031 * commit update of parent directory and link object
1036 rc = txCommit(tid, 2, &iplist[0], 0);
1040 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1041 mutex_unlock(&JFS_IP(dip)->commit_mutex);
1045 unlock_new_inode(ip);
1048 d_instantiate(dentry, ip);
1049 unlock_new_inode(ip);
1053 free_UCSname(&dname);
1056 jfs_info("jfs_symlink: rc:%d", rc);
1064 * FUNCTION: rename a file or directory
1066 static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1067 struct inode *new_dir, struct dentry *new_dentry)
1069 struct btstack btstack;
1071 struct component_name new_dname;
1072 struct inode *new_ip;
1073 struct component_name old_dname;
1074 struct inode *old_ip;
1078 struct dt_lock *dtlck;
1081 struct inode *iplist[4];
1082 struct tblock *tblk;
1087 jfs_info("jfs_rename: %s %s", old_dentry->d_name.name,
1088 new_dentry->d_name.name);
1090 old_ip = old_dentry->d_inode;
1091 new_ip = new_dentry->d_inode;
1093 if ((rc = get_UCSname(&old_dname, old_dentry)))
1096 if ((rc = get_UCSname(&new_dname, new_dentry)))
1100 * Make sure source inode number is what we think it is
1102 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1103 if (rc || (ino != old_ip->i_ino)) {
1109 * Make sure dest inode number (if any) is what we think it is
1111 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1113 if ((!new_ip) || (ino != new_ip->i_ino)) {
1117 } else if (rc != -ENOENT)
1120 /* no entry exists, but one was expected */
1125 if (S_ISDIR(old_ip->i_mode)) {
1127 if (!dtEmpty(new_ip)) {
1131 } else if ((new_dir != old_dir) &&
1132 (new_dir->i_nlink == JFS_LINK_MAX)) {
1136 } else if (new_ip) {
1137 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
1138 /* Init inode for quota operations. */
1139 vfs_dq_init(new_ip);
1143 * The real work starts here
1145 tid = txBegin(new_dir->i_sb, 0);
1148 * How do we know the locking is safe from deadlocks?
1149 * The vfs does the hard part for us. Any time we are taking nested
1150 * commit_mutexes, the vfs already has i_mutex held on the parent.
1151 * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1153 mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1154 mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1155 if (old_dir != new_dir)
1156 mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1157 COMMIT_MUTEX_SECOND_PARENT);
1160 mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1161 COMMIT_MUTEX_VICTIM);
1163 * Change existing directory entry to new inode number
1165 ino = new_ip->i_ino;
1166 rc = dtModify(tid, new_dir, &new_dname, &ino,
1167 old_ip->i_ino, JFS_RENAME);
1171 if (S_ISDIR(new_ip->i_mode)) {
1173 if (new_ip->i_nlink) {
1174 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1175 if (old_dir != new_dir)
1176 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1177 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1178 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1179 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1180 IWRITE_UNLOCK(new_ip);
1181 jfs_error(new_ip->i_sb,
1182 "jfs_rename: new_ip->i_nlink != 0");
1185 tblk = tid_to_tblock(tid);
1186 tblk->xflag |= COMMIT_DELETE;
1187 tblk->u.ip = new_ip;
1188 } else if (new_ip->i_nlink == 0) {
1189 assert(!test_cflag(COMMIT_Nolink, new_ip));
1190 /* free block resources */
1191 if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1192 txAbort(tid, 1); /* Marks FS Dirty */
1196 tblk = tid_to_tblock(tid);
1197 tblk->xflag |= COMMIT_DELETE;
1198 tblk->u.ip = new_ip;
1200 new_ip->i_ctime = CURRENT_TIME;
1201 mark_inode_dirty(new_ip);
1205 * Add new directory entry
1207 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1210 jfs_err("jfs_rename didn't expect dtSearch to fail "
1215 ino = old_ip->i_ino;
1216 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1219 jfs_err("jfs_rename: dtInsert returned -EIO");
1222 if (S_ISDIR(old_ip->i_mode))
1226 * Remove old directory entry
1229 ino = old_ip->i_ino;
1230 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1232 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1234 txAbort(tid, 1); /* Marks Filesystem dirty */
1237 if (S_ISDIR(old_ip->i_mode)) {
1238 drop_nlink(old_dir);
1239 if (old_dir != new_dir) {
1241 * Change inode number of parent for moved directory
1244 JFS_IP(old_ip)->i_dtroot.header.idotdot =
1245 cpu_to_le32(new_dir->i_ino);
1247 /* Linelock header of dtree */
1248 tlck = txLock(tid, old_ip,
1249 (struct metapage *) &JFS_IP(old_ip)->bxflag,
1250 tlckDTREE | tlckBTROOT | tlckRELINK);
1251 dtlck = (struct dt_lock *) & tlck->lock;
1252 ASSERT(dtlck->index == 0);
1253 lv = & dtlck->lv[0];
1261 * Update ctime on changed/moved inodes & mark dirty
1263 old_ip->i_ctime = CURRENT_TIME;
1264 mark_inode_dirty(old_ip);
1266 new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
1267 mark_inode_dirty(new_dir);
1269 /* Build list of inodes modified by this transaction */
1271 iplist[ipcount++] = old_ip;
1273 iplist[ipcount++] = new_ip;
1274 iplist[ipcount++] = old_dir;
1276 if (old_dir != new_dir) {
1277 iplist[ipcount++] = new_dir;
1278 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1279 mark_inode_dirty(old_dir);
1283 * Incomplete truncate of file data can
1284 * result in timing problems unless we synchronously commit the
1288 commit_flag = COMMIT_SYNC;
1292 rc = txCommit(tid, ipcount, iplist, commit_flag);
1297 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1298 if (old_dir != new_dir)
1299 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1300 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1301 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1303 while (new_size && (rc == 0)) {
1304 tid = txBegin(new_ip->i_sb, 0);
1305 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1306 new_size = xtTruncate_pmap(tid, new_ip, new_size);
1311 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1313 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1315 if (new_ip && (new_ip->i_nlink == 0))
1316 set_cflag(COMMIT_Nolink, new_ip);
1318 free_UCSname(&new_dname);
1320 free_UCSname(&old_dname);
1322 if (new_ip && !S_ISDIR(new_ip->i_mode))
1323 IWRITE_UNLOCK(new_ip);
1325 * Truncating the directory index table is not guaranteed. It
1326 * may need to be done iteratively
1328 if (test_cflag(COMMIT_Stale, old_dir)) {
1329 if (old_dir->i_size > 1)
1330 jfs_truncate_nolock(old_dir, 0);
1332 clear_cflag(COMMIT_Stale, old_dir);
1335 jfs_info("jfs_rename: returning %d", rc);
1343 * FUNCTION: Create a special file (device)
1345 static int jfs_mknod(struct inode *dir, struct dentry *dentry,
1346 int mode, dev_t rdev)
1348 struct jfs_inode_info *jfs_ip;
1349 struct btstack btstack;
1350 struct component_name dname;
1353 struct inode *iplist[2];
1356 struct tblock *tblk;
1358 if (!new_valid_dev(rdev))
1361 jfs_info("jfs_mknod: %s", dentry->d_name.name);
1363 if ((rc = get_UCSname(&dname, dentry)))
1366 ip = ialloc(dir, mode);
1371 jfs_ip = JFS_IP(ip);
1373 tid = txBegin(dir->i_sb, 0);
1375 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1376 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1378 rc = jfs_init_acl(tid, ip, dir);
1382 rc = jfs_init_security(tid, ip, dir);
1388 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1393 tblk = tid_to_tblock(tid);
1394 tblk->xflag |= COMMIT_CREATE;
1395 tblk->ino = ip->i_ino;
1396 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1399 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1404 ip->i_op = &jfs_file_inode_operations;
1405 jfs_ip->dev = new_encode_dev(rdev);
1406 init_special_inode(ip, ip->i_mode, rdev);
1408 mark_inode_dirty(ip);
1410 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
1412 mark_inode_dirty(dir);
1416 rc = txCommit(tid, 2, iplist, 0);
1420 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1421 mutex_unlock(&JFS_IP(dir)->commit_mutex);
1425 unlock_new_inode(ip);
1428 d_instantiate(dentry, ip);
1429 unlock_new_inode(ip);
1433 free_UCSname(&dname);
1436 jfs_info("jfs_mknod: returning %d", rc);
1440 static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd)
1442 struct btstack btstack;
1445 struct component_name key;
1446 const char *name = dentry->d_name.name;
1447 int len = dentry->d_name.len;
1450 jfs_info("jfs_lookup: name = %s", name);
1452 if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)
1453 dentry->d_op = &jfs_ci_dentry_operations;
1455 if ((name[0] == '.') && (len == 1))
1457 else if (strcmp(name, "..") == 0)
1460 if ((rc = get_UCSname(&key, dentry)))
1462 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1464 if (rc == -ENOENT) {
1465 d_add(dentry, NULL);
1468 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1473 ip = jfs_iget(dip->i_sb, inum);
1475 jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
1476 return ERR_CAST(ip);
1479 dentry = d_splice_alias(ip, dentry);
1481 if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2))
1482 dentry->d_op = &jfs_ci_dentry_operations;
1487 static struct inode *jfs_nfs_get_inode(struct super_block *sb,
1488 u64 ino, u32 generation)
1490 struct inode *inode;
1493 return ERR_PTR(-ESTALE);
1494 inode = jfs_iget(sb, ino);
1496 return ERR_CAST(inode);
1498 if (generation && inode->i_generation != generation) {
1500 return ERR_PTR(-ESTALE);
1506 struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1507 int fh_len, int fh_type)
1509 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1513 struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1514 int fh_len, int fh_type)
1516 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1520 struct dentry *jfs_get_parent(struct dentry *dentry)
1522 unsigned long parent_ino;
1525 le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
1527 return d_obtain_alias(jfs_iget(dentry->d_inode->i_sb, parent_ino));
1530 const struct inode_operations jfs_dir_inode_operations = {
1531 .create = jfs_create,
1532 .lookup = jfs_lookup,
1534 .unlink = jfs_unlink,
1535 .symlink = jfs_symlink,
1539 .rename = jfs_rename,
1540 .setxattr = jfs_setxattr,
1541 .getxattr = jfs_getxattr,
1542 .listxattr = jfs_listxattr,
1543 .removexattr = jfs_removexattr,
1544 #ifdef CONFIG_JFS_POSIX_ACL
1545 .setattr = jfs_setattr,
1546 .permission = jfs_permission,
1550 const struct file_operations jfs_dir_operations = {
1551 .read = generic_read_dir,
1552 .readdir = jfs_readdir,
1554 .unlocked_ioctl = jfs_ioctl,
1555 #ifdef CONFIG_COMPAT
1556 .compat_ioctl = jfs_compat_ioctl,
1558 .llseek = generic_file_llseek,
1561 static int jfs_ci_hash(struct dentry *dir, struct qstr *this)
1566 hash = init_name_hash();
1567 for (i=0; i < this->len; i++)
1568 hash = partial_name_hash(tolower(this->name[i]), hash);
1569 this->hash = end_name_hash(hash);
1574 static int jfs_ci_compare(struct dentry *dir, struct qstr *a, struct qstr *b)
1578 if (a->len != b->len)
1580 for (i=0; i < a->len; i++) {
1581 if (tolower(a->name[i]) != tolower(b->name[i]))
1587 * We want creates to preserve case. A negative dentry, a, that
1588 * has a different case than b may cause a new entry to be created
1589 * with the wrong case. Since we can't tell if a comes from a negative
1590 * dentry, we blindly replace it with b. This should be harmless if
1591 * a is not a negative dentry.
1593 memcpy((unsigned char *)a->name, b->name, a->len);
1598 const struct dentry_operations jfs_ci_dentry_operations =
1600 .d_hash = jfs_ci_hash,
1601 .d_compare = jfs_ci_compare,