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 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 insert_inode_hash(ip);
159 mark_inode_dirty(ip);
161 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
163 mark_inode_dirty(dip);
165 rc = txCommit(tid, 2, &iplist[0], 0);
169 mutex_unlock(&JFS_IP(ip)->commit_mutex);
170 mutex_unlock(&JFS_IP(dip)->commit_mutex);
176 d_instantiate(dentry, ip);
179 free_UCSname(&dname);
183 jfs_info("jfs_create: rc:%d", rc);
189 * NAME: jfs_mkdir(dip, dentry, mode)
191 * FUNCTION: create a child directory in the parent directory <dip>
192 * with name = <from dentry> and mode = <mode>
194 * PARAMETER: dip - parent directory vnode
195 * dentry - dentry of child directory
196 * mode - create mode (rwxrwxrwx).
198 * RETURN: Errors from subroutines
201 * EACCESS: user needs search+write permission on the parent directory
203 static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode)
206 tid_t tid; /* transaction id */
207 struct inode *ip = NULL; /* child directory inode */
209 struct component_name dname; /* child directory name */
210 struct btstack btstack;
211 struct inode *iplist[2];
214 jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name);
216 /* link count overflow on parent directory ? */
217 if (dip->i_nlink == JFS_LINK_MAX) {
223 * search parent directory for entry/freespace
224 * (dtSearch() returns parent directory page pinned)
226 if ((rc = get_UCSname(&dname, dentry)))
230 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
231 * block there while holding dtree page, so we allocate the inode &
232 * begin the transaction before we search the directory.
234 ip = ialloc(dip, S_IFDIR | mode);
240 tid = txBegin(dip->i_sb, 0);
242 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
243 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
245 rc = jfs_init_acl(tid, ip, dip);
249 rc = jfs_init_security(tid, ip, dip);
255 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
256 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
261 tblk = tid_to_tblock(tid);
262 tblk->xflag |= COMMIT_CREATE;
263 tblk->ino = ip->i_ino;
264 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
270 * initialize the child directory in-line in inode
272 dtInitRoot(tid, ip, dip->i_ino);
275 * create entry in parent directory for child directory
276 * (dtInsert() releases parent directory page)
279 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
281 jfs_err("jfs_mkdir: dtInsert returned -EIO");
282 txAbort(tid, 1); /* Marks Filesystem dirty */
284 txAbort(tid, 0); /* Filesystem full */
288 ip->i_nlink = 2; /* for '.' */
289 ip->i_op = &jfs_dir_inode_operations;
290 ip->i_fop = &jfs_dir_operations;
292 insert_inode_hash(ip);
293 mark_inode_dirty(ip);
295 /* update parent directory inode */
296 inc_nlink(dip); /* for '..' from child directory */
297 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
298 mark_inode_dirty(dip);
300 rc = txCommit(tid, 2, &iplist[0], 0);
304 mutex_unlock(&JFS_IP(ip)->commit_mutex);
305 mutex_unlock(&JFS_IP(dip)->commit_mutex);
311 d_instantiate(dentry, ip);
314 free_UCSname(&dname);
319 jfs_info("jfs_mkdir: rc:%d", rc);
324 * NAME: jfs_rmdir(dip, dentry)
326 * FUNCTION: remove a link to child directory
328 * PARAMETER: dip - parent inode
329 * dentry - child directory dentry
331 * RETURN: -EINVAL - if name is . or ..
332 * -EINVAL - if . or .. exist but are invalid.
333 * errors from subroutines
336 * if other threads have the directory open when the last link
337 * is removed, the "." and ".." entries, if present, are removed before
338 * rmdir() returns and no new entries may be created in the directory,
339 * but the directory is not removed until the last reference to
340 * the directory is released (cf.unlink() of regular file).
342 static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
345 tid_t tid; /* transaction id */
346 struct inode *ip = dentry->d_inode;
348 struct component_name dname;
349 struct inode *iplist[2];
352 jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name);
354 /* Init inode for quota operations. */
357 /* directory must be empty to be removed */
363 if ((rc = get_UCSname(&dname, dentry))) {
367 tid = txBegin(dip->i_sb, 0);
369 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
370 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
375 tblk = tid_to_tblock(tid);
376 tblk->xflag |= COMMIT_DELETE;
380 * delete the entry of target directory from parent directory
383 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
384 jfs_err("jfs_rmdir: dtDelete returned %d", rc);
388 mutex_unlock(&JFS_IP(ip)->commit_mutex);
389 mutex_unlock(&JFS_IP(dip)->commit_mutex);
394 /* update parent directory's link count corresponding
395 * to ".." entry of the target directory deleted
397 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
398 inode_dec_link_count(dip);
401 * OS/2 could have created EA and/or ACL
403 /* free EA from both persistent and working map */
404 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
406 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
408 JFS_IP(ip)->ea.flag = 0;
410 /* free ACL from both persistent and working map */
411 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
413 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
415 JFS_IP(ip)->acl.flag = 0;
417 /* mark the target directory as deleted */
419 mark_inode_dirty(ip);
421 rc = txCommit(tid, 2, &iplist[0], 0);
425 mutex_unlock(&JFS_IP(ip)->commit_mutex);
426 mutex_unlock(&JFS_IP(dip)->commit_mutex);
429 * Truncating the directory index table is not guaranteed. It
430 * may need to be done iteratively
432 if (test_cflag(COMMIT_Stale, dip)) {
434 jfs_truncate_nolock(dip, 0);
436 clear_cflag(COMMIT_Stale, dip);
440 free_UCSname(&dname);
443 jfs_info("jfs_rmdir: rc:%d", rc);
448 * NAME: jfs_unlink(dip, dentry)
450 * FUNCTION: remove a link to object <vp> named by <name>
451 * from parent directory <dvp>
453 * PARAMETER: dip - inode of parent directory
454 * dentry - dentry of object to be removed
456 * RETURN: errors from subroutines
459 * temporary file: if one or more processes have the file open
460 * when the last link is removed, the link will be removed before
461 * unlink() returns, but the removal of the file contents will be
462 * postponed until all references to the files are closed.
464 * JFS does NOT support unlink() on directories.
467 static int jfs_unlink(struct inode *dip, struct dentry *dentry)
470 tid_t tid; /* transaction id */
471 struct inode *ip = dentry->d_inode;
473 struct component_name dname; /* object name */
474 struct inode *iplist[2];
479 jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name);
481 /* Init inode for quota operations. */
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;
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 = old_dentry->d_inode;
791 struct component_name dname;
792 struct btstack btstack;
793 struct inode *iplist[2];
795 jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
796 dentry->d_name.name);
798 if (ip->i_nlink == JFS_LINK_MAX)
801 if (ip->i_nlink == 0)
804 tid = txBegin(ip->i_sb, 0);
806 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
807 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
810 * scan parent directory for entry/freespace
812 if ((rc = get_UCSname(&dname, dentry)))
815 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
819 * create entry for new link in parent directory
822 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
825 /* update object inode */
826 inc_nlink(ip); /* for new link */
827 ip->i_ctime = CURRENT_TIME;
828 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
829 mark_inode_dirty(dir);
830 atomic_inc(&ip->i_count);
834 rc = txCommit(tid, 2, &iplist[0], 0);
837 ip->i_nlink--; /* never instantiated */
840 d_instantiate(dentry, ip);
843 free_UCSname(&dname);
848 mutex_unlock(&JFS_IP(ip)->commit_mutex);
849 mutex_unlock(&JFS_IP(dir)->commit_mutex);
851 jfs_info("jfs_link: rc:%d", rc);
856 * NAME: jfs_symlink(dip, dentry, name)
858 * FUNCTION: creates a symbolic link to <symlink> by name <name>
861 * PARAMETER: dip - parent directory vnode
862 * dentry - dentry of symbolic link
863 * name - the path name of the existing object
864 * that will be the source of the link
866 * RETURN: errors from subroutines
869 * ENAMETOOLONG: pathname resolution of a symbolic link produced
870 * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
873 static int jfs_symlink(struct inode *dip, struct dentry *dentry,
879 struct component_name dname;
880 int ssize; /* source pathname size */
881 struct btstack btstack;
882 struct inode *ip = dentry->d_inode;
883 unchar *i_fastsymlink;
885 int bmask = 0, xsize;
886 s64 extent = 0, xaddr;
888 struct super_block *sb;
891 struct inode *iplist[2];
893 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
895 ssize = strlen(name) + 1;
898 * search parent directory for entry/freespace
899 * (dtSearch() returns parent directory page pinned)
902 if ((rc = get_UCSname(&dname, dentry)))
906 * allocate on-disk/in-memory inode for symbolic link:
907 * (iAlloc() returns new, locked inode)
909 ip = ialloc(dip, S_IFLNK | 0777);
915 tid = txBegin(dip->i_sb, 0);
917 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
918 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
920 rc = jfs_init_security(tid, ip, dip);
924 tblk = tid_to_tblock(tid);
925 tblk->xflag |= COMMIT_CREATE;
926 tblk->ino = ip->i_ino;
927 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
929 /* fix symlink access permission
930 * (dir_create() ANDs in the u.u_cmask,
931 * but symlinks really need to be 777 access)
936 * write symbolic link target path name
941 * write source path name inline in on-disk inode (fast symbolic link)
944 if (ssize <= IDATASIZE) {
945 ip->i_op = &jfs_symlink_inode_operations;
947 i_fastsymlink = JFS_IP(ip)->i_inline;
948 memcpy(i_fastsymlink, name, ssize);
949 ip->i_size = ssize - 1;
952 * if symlink is > 128 bytes, we don't have the space to
953 * store inline extended attributes
955 if (ssize > sizeof (JFS_IP(ip)->i_inline))
956 JFS_IP(ip)->mode2 &= ~INLINEEA;
958 jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ",
962 * write source path name in a single extent
965 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
967 ip->i_op = &page_symlink_inode_operations;
968 ip->i_mapping->a_ops = &jfs_aops;
971 * even though the data of symlink object (source
972 * path name) is treated as non-journaled user data,
973 * it is read/written thru buffer cache for performance.
976 bmask = JFS_SBI(sb)->bsize - 1;
977 xsize = (ssize + bmask) & ~bmask;
979 xlen = xsize >> JFS_SBI(sb)->l2bsize;
980 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
985 ip->i_size = ssize - 1;
987 /* This is kind of silly since PATH_MAX == 4K */
988 int copy_size = min(ssize, PSIZE);
990 mp = get_metapage(ip, xaddr, PSIZE, 1);
993 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
998 memcpy(mp->data, name, copy_size);
1002 xaddr += JFS_SBI(sb)->nbperpage;
1007 * create entry for symbolic link in parent directory
1009 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1012 rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1016 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1018 /* discard new inode */
1022 insert_inode_hash(ip);
1023 mark_inode_dirty(ip);
1025 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
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);
1044 d_instantiate(dentry, ip);
1047 free_UCSname(&dname);
1050 jfs_info("jfs_symlink: rc:%d", rc);
1058 * FUNCTION: rename a file or directory
1060 static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1061 struct inode *new_dir, struct dentry *new_dentry)
1063 struct btstack btstack;
1065 struct component_name new_dname;
1066 struct inode *new_ip;
1067 struct component_name old_dname;
1068 struct inode *old_ip;
1072 struct dt_lock *dtlck;
1075 struct inode *iplist[4];
1076 struct tblock *tblk;
1081 jfs_info("jfs_rename: %s %s", old_dentry->d_name.name,
1082 new_dentry->d_name.name);
1084 old_ip = old_dentry->d_inode;
1085 new_ip = new_dentry->d_inode;
1087 if ((rc = get_UCSname(&old_dname, old_dentry)))
1090 if ((rc = get_UCSname(&new_dname, new_dentry)))
1094 * Make sure source inode number is what we think it is
1096 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1097 if (rc || (ino != old_ip->i_ino)) {
1103 * Make sure dest inode number (if any) is what we think it is
1105 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1107 if ((new_ip == 0) || (ino != new_ip->i_ino)) {
1111 } else if (rc != -ENOENT)
1114 /* no entry exists, but one was expected */
1119 if (S_ISDIR(old_ip->i_mode)) {
1121 if (!dtEmpty(new_ip)) {
1125 } else if ((new_dir != old_dir) &&
1126 (new_dir->i_nlink == JFS_LINK_MAX)) {
1130 } else if (new_ip) {
1131 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
1132 /* Init inode for quota operations. */
1137 * The real work starts here
1139 tid = txBegin(new_dir->i_sb, 0);
1142 * How do we know the locking is safe from deadlocks?
1143 * The vfs does the hard part for us. Any time we are taking nested
1144 * commit_mutexes, the vfs already has i_mutex held on the parent.
1145 * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1147 mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1148 mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1149 if (old_dir != new_dir)
1150 mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1151 COMMIT_MUTEX_SECOND_PARENT);
1154 mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1155 COMMIT_MUTEX_VICTIM);
1157 * Change existing directory entry to new inode number
1159 ino = new_ip->i_ino;
1160 rc = dtModify(tid, new_dir, &new_dname, &ino,
1161 old_ip->i_ino, JFS_RENAME);
1165 if (S_ISDIR(new_ip->i_mode)) {
1167 if (new_ip->i_nlink) {
1168 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1169 if (old_dir != new_dir)
1170 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1171 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1172 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1173 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1174 IWRITE_UNLOCK(new_ip);
1175 jfs_error(new_ip->i_sb,
1176 "jfs_rename: new_ip->i_nlink != 0");
1179 tblk = tid_to_tblock(tid);
1180 tblk->xflag |= COMMIT_DELETE;
1181 tblk->u.ip = new_ip;
1182 } else if (new_ip->i_nlink == 0) {
1183 assert(!test_cflag(COMMIT_Nolink, new_ip));
1184 /* free block resources */
1185 if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1186 txAbort(tid, 1); /* Marks FS Dirty */
1190 tblk = tid_to_tblock(tid);
1191 tblk->xflag |= COMMIT_DELETE;
1192 tblk->u.ip = new_ip;
1194 new_ip->i_ctime = CURRENT_TIME;
1195 mark_inode_dirty(new_ip);
1199 * Add new directory entry
1201 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1204 jfs_err("jfs_rename didn't expect dtSearch to fail "
1209 ino = old_ip->i_ino;
1210 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1213 jfs_err("jfs_rename: dtInsert returned -EIO");
1216 if (S_ISDIR(old_ip->i_mode))
1220 * Remove old directory entry
1223 ino = old_ip->i_ino;
1224 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1226 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1228 txAbort(tid, 1); /* Marks Filesystem dirty */
1231 if (S_ISDIR(old_ip->i_mode)) {
1232 drop_nlink(old_dir);
1233 if (old_dir != new_dir) {
1235 * Change inode number of parent for moved directory
1238 JFS_IP(old_ip)->i_dtroot.header.idotdot =
1239 cpu_to_le32(new_dir->i_ino);
1241 /* Linelock header of dtree */
1242 tlck = txLock(tid, old_ip,
1243 (struct metapage *) &JFS_IP(old_ip)->bxflag,
1244 tlckDTREE | tlckBTROOT | tlckRELINK);
1245 dtlck = (struct dt_lock *) & tlck->lock;
1246 ASSERT(dtlck->index == 0);
1247 lv = & dtlck->lv[0];
1255 * Update ctime on changed/moved inodes & mark dirty
1257 old_ip->i_ctime = CURRENT_TIME;
1258 mark_inode_dirty(old_ip);
1260 new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
1261 mark_inode_dirty(new_dir);
1263 /* Build list of inodes modified by this transaction */
1265 iplist[ipcount++] = old_ip;
1267 iplist[ipcount++] = new_ip;
1268 iplist[ipcount++] = old_dir;
1270 if (old_dir != new_dir) {
1271 iplist[ipcount++] = new_dir;
1272 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1273 mark_inode_dirty(old_dir);
1277 * Incomplete truncate of file data can
1278 * result in timing problems unless we synchronously commit the
1282 commit_flag = COMMIT_SYNC;
1286 rc = txCommit(tid, ipcount, iplist, commit_flag);
1291 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1292 if (old_dir != new_dir)
1293 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1294 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1295 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1297 while (new_size && (rc == 0)) {
1298 tid = txBegin(new_ip->i_sb, 0);
1299 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1300 new_size = xtTruncate_pmap(tid, new_ip, new_size);
1305 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1307 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1309 if (new_ip && (new_ip->i_nlink == 0))
1310 set_cflag(COMMIT_Nolink, new_ip);
1312 free_UCSname(&new_dname);
1314 free_UCSname(&old_dname);
1316 if (new_ip && !S_ISDIR(new_ip->i_mode))
1317 IWRITE_UNLOCK(new_ip);
1319 * Truncating the directory index table is not guaranteed. It
1320 * may need to be done iteratively
1322 if (test_cflag(COMMIT_Stale, old_dir)) {
1323 if (old_dir->i_size > 1)
1324 jfs_truncate_nolock(old_dir, 0);
1326 clear_cflag(COMMIT_Stale, old_dir);
1329 jfs_info("jfs_rename: returning %d", rc);
1337 * FUNCTION: Create a special file (device)
1339 static int jfs_mknod(struct inode *dir, struct dentry *dentry,
1340 int mode, dev_t rdev)
1342 struct jfs_inode_info *jfs_ip;
1343 struct btstack btstack;
1344 struct component_name dname;
1347 struct inode *iplist[2];
1350 struct tblock *tblk;
1352 if (!new_valid_dev(rdev))
1355 jfs_info("jfs_mknod: %s", dentry->d_name.name);
1357 if ((rc = get_UCSname(&dname, dentry)))
1360 ip = ialloc(dir, mode);
1365 jfs_ip = JFS_IP(ip);
1367 tid = txBegin(dir->i_sb, 0);
1369 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1370 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1372 rc = jfs_init_acl(tid, ip, dir);
1376 rc = jfs_init_security(tid, ip, dir);
1382 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1387 tblk = tid_to_tblock(tid);
1388 tblk->xflag |= COMMIT_CREATE;
1389 tblk->ino = ip->i_ino;
1390 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1393 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1398 ip->i_op = &jfs_file_inode_operations;
1399 jfs_ip->dev = new_encode_dev(rdev);
1400 init_special_inode(ip, ip->i_mode, rdev);
1402 insert_inode_hash(ip);
1403 mark_inode_dirty(ip);
1405 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
1407 mark_inode_dirty(dir);
1411 rc = txCommit(tid, 2, iplist, 0);
1415 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1416 mutex_unlock(&JFS_IP(dir)->commit_mutex);
1422 d_instantiate(dentry, ip);
1425 free_UCSname(&dname);
1428 jfs_info("jfs_mknod: returning %d", rc);
1432 static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd)
1434 struct btstack btstack;
1437 struct component_name key;
1438 const char *name = dentry->d_name.name;
1439 int len = dentry->d_name.len;
1442 jfs_info("jfs_lookup: name = %s", name);
1444 if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)
1445 dentry->d_op = &jfs_ci_dentry_operations;
1447 if ((name[0] == '.') && (len == 1))
1449 else if (strcmp(name, "..") == 0)
1452 if ((rc = get_UCSname(&key, dentry)))
1454 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1456 if (rc == -ENOENT) {
1457 d_add(dentry, NULL);
1460 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1465 ip = iget(dip->i_sb, inum);
1466 if (ip == NULL || is_bad_inode(ip)) {
1467 jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
1470 return ERR_PTR(-EACCES);
1473 dentry = d_splice_alias(ip, dentry);
1475 if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2))
1476 dentry->d_op = &jfs_ci_dentry_operations;
1481 static struct inode *jfs_nfs_get_inode(struct super_block *sb,
1482 u64 ino, u32 generation)
1484 struct inode *inode;
1487 return ERR_PTR(-ESTALE);
1488 inode = iget(sb, ino);
1490 return ERR_PTR(-ENOMEM);
1492 if (is_bad_inode(inode) ||
1493 (generation && inode->i_generation != generation)) {
1495 return ERR_PTR(-ESTALE);
1501 struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1502 int fh_len, int fh_type)
1504 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1508 struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1509 int fh_len, int fh_type)
1511 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1515 struct dentry *jfs_get_parent(struct dentry *dentry)
1517 struct super_block *sb = dentry->d_inode->i_sb;
1518 struct dentry *parent = ERR_PTR(-ENOENT);
1519 struct inode *inode;
1520 unsigned long parent_ino;
1523 le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
1524 inode = iget(sb, parent_ino);
1526 if (is_bad_inode(inode)) {
1528 parent = ERR_PTR(-EACCES);
1530 parent = d_alloc_anon(inode);
1532 parent = ERR_PTR(-ENOMEM);
1541 const struct inode_operations jfs_dir_inode_operations = {
1542 .create = jfs_create,
1543 .lookup = jfs_lookup,
1545 .unlink = jfs_unlink,
1546 .symlink = jfs_symlink,
1550 .rename = jfs_rename,
1551 .setxattr = jfs_setxattr,
1552 .getxattr = jfs_getxattr,
1553 .listxattr = jfs_listxattr,
1554 .removexattr = jfs_removexattr,
1555 #ifdef CONFIG_JFS_POSIX_ACL
1556 .setattr = jfs_setattr,
1557 .permission = jfs_permission,
1561 const struct file_operations jfs_dir_operations = {
1562 .read = generic_read_dir,
1563 .readdir = jfs_readdir,
1568 static int jfs_ci_hash(struct dentry *dir, struct qstr *this)
1573 hash = init_name_hash();
1574 for (i=0; i < this->len; i++)
1575 hash = partial_name_hash(tolower(this->name[i]), hash);
1576 this->hash = end_name_hash(hash);
1581 static int jfs_ci_compare(struct dentry *dir, struct qstr *a, struct qstr *b)
1585 if (a->len != b->len)
1587 for (i=0; i < a->len; i++) {
1588 if (tolower(a->name[i]) != tolower(b->name[i]))
1594 * We want creates to preserve case. A negative dentry, a, that
1595 * has a different case than b may cause a new entry to be created
1596 * with the wrong case. Since we can't tell if a comes from a negative
1597 * dentry, we blindly replace it with b. This should be harmless if
1598 * a is not a negative dentry.
1600 memcpy((unsigned char *)a->name, b->name, a->len);
1605 struct dentry_operations jfs_ci_dentry_operations =
1607 .d_hash = jfs_ci_hash,
1608 .d_compare = jfs_ci_compare,