Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
new file mode 100644
index 0000000..8413a36
--- /dev/null
+++ b/fs/jfs/namei.c
@@ -0,0 +1,1540 @@
+/*
+ * Copyright (C) International Business Machines Corp., 2000-2004
+ * Portions Copyright (C) Christoph Hellwig, 2001-2002
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/fs.h>
+#include <linux/ctype.h>
+#include <linux/quotaops.h>
+#include "jfs_incore.h"
+#include "jfs_superblock.h"
+#include "jfs_inode.h"
+#include "jfs_dinode.h"
+#include "jfs_dmap.h"
+#include "jfs_unicode.h"
+#include "jfs_metapage.h"
+#include "jfs_xattr.h"
+#include "jfs_acl.h"
+#include "jfs_debug.h"
+
+extern struct inode_operations jfs_file_inode_operations;
+extern struct inode_operations jfs_symlink_inode_operations;
+extern struct file_operations jfs_file_operations;
+extern struct address_space_operations jfs_aops;
+
+extern int jfs_fsync(struct file *, struct dentry *, int);
+extern void jfs_truncate_nolock(struct inode *, loff_t);
+extern int jfs_init_acl(struct inode *, struct inode *);
+
+/*
+ * forward references
+ */
+struct inode_operations jfs_dir_inode_operations;
+struct file_operations jfs_dir_operations;
+struct dentry_operations jfs_ci_dentry_operations;
+
+static s64 commitZeroLink(tid_t, struct inode *);
+
+/*
+ * NAME: jfs_create(dip, dentry, mode)
+ *
+ * FUNCTION: create a regular file in the parent directory <dip>
+ * with name = <from dentry> and mode = <mode>
+ *
+ * PARAMETER: dip - parent directory vnode
+ * dentry - dentry of new file
+ * mode - create mode (rwxrwxrwx).
+ * nd- nd struct
+ *
+ * RETURN: Errors from subroutines
+ *
+ */
+static int jfs_create(struct inode *dip, struct dentry *dentry, int mode,
+ struct nameidata *nd)
+{
+ int rc = 0;
+ tid_t tid; /* transaction id */
+ struct inode *ip = NULL; /* child directory inode */
+ ino_t ino;
+ struct component_name dname; /* child directory name */
+ struct btstack btstack;
+ struct inode *iplist[2];
+ struct tblock *tblk;
+
+ jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name);
+
+ /*
+ * search parent directory for entry/freespace
+ * (dtSearch() returns parent directory page pinned)
+ */
+ if ((rc = get_UCSname(&dname, dentry)))
+ goto out1;
+
+ /*
+ * Either iAlloc() or txBegin() may block. Deadlock can occur if we
+ * block there while holding dtree page, so we allocate the inode &
+ * begin the transaction before we search the directory.
+ */
+ ip = ialloc(dip, mode);
+ if (ip == NULL) {
+ rc = -ENOSPC;
+ goto out2;
+ }
+
+ tid = txBegin(dip->i_sb, 0);
+
+ down(&JFS_IP(dip)->commit_sem);
+ down(&JFS_IP(ip)->commit_sem);
+
+ if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
+ jfs_err("jfs_create: dtSearch returned %d", rc);
+ goto out3;
+ }
+
+ tblk = tid_to_tblock(tid);
+ tblk->xflag |= COMMIT_CREATE;
+ tblk->ino = ip->i_ino;
+ tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
+
+ iplist[0] = dip;
+ iplist[1] = ip;
+
+ /*
+ * initialize the child XAD tree root in-line in inode
+ */
+ xtInitRoot(tid, ip);
+
+ /*
+ * create entry in parent directory for child directory
+ * (dtInsert() releases parent directory page)
+ */
+ ino = ip->i_ino;
+ if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
+ if (rc == -EIO) {
+ jfs_err("jfs_create: dtInsert returned -EIO");
+ txAbort(tid, 1); /* Marks Filesystem dirty */
+ } else
+ txAbort(tid, 0); /* Filesystem full */
+ goto out3;
+ }
+
+ ip->i_op = &jfs_file_inode_operations;
+ ip->i_fop = &jfs_file_operations;
+ ip->i_mapping->a_ops = &jfs_aops;
+
+ insert_inode_hash(ip);
+ mark_inode_dirty(ip);
+
+ dip->i_ctime = dip->i_mtime = CURRENT_TIME;
+
+ mark_inode_dirty(dip);
+
+ rc = txCommit(tid, 2, &iplist[0], 0);
+
+ out3:
+ txEnd(tid);
+ up(&JFS_IP(dip)->commit_sem);
+ up(&JFS_IP(ip)->commit_sem);
+ if (rc) {
+ ip->i_nlink = 0;
+ iput(ip);
+ } else
+ d_instantiate(dentry, ip);
+
+ out2:
+ free_UCSname(&dname);
+
+#ifdef CONFIG_JFS_POSIX_ACL
+ if (rc == 0)
+ jfs_init_acl(ip, dip);
+#endif
+
+ out1:
+
+ jfs_info("jfs_create: rc:%d", rc);
+ return rc;
+}
+
+
+/*
+ * NAME: jfs_mkdir(dip, dentry, mode)
+ *
+ * FUNCTION: create a child directory in the parent directory <dip>
+ * with name = <from dentry> and mode = <mode>
+ *
+ * PARAMETER: dip - parent directory vnode
+ * dentry - dentry of child directory
+ * mode - create mode (rwxrwxrwx).
+ *
+ * RETURN: Errors from subroutines
+ *
+ * note:
+ * EACCESS: user needs search+write permission on the parent directory
+ */
+static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode)
+{
+ int rc = 0;
+ tid_t tid; /* transaction id */
+ struct inode *ip = NULL; /* child directory inode */
+ ino_t ino;
+ struct component_name dname; /* child directory name */
+ struct btstack btstack;
+ struct inode *iplist[2];
+ struct tblock *tblk;
+
+ jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name);
+
+ /* link count overflow on parent directory ? */
+ if (dip->i_nlink == JFS_LINK_MAX) {
+ rc = -EMLINK;
+ goto out1;
+ }
+
+ /*
+ * search parent directory for entry/freespace
+ * (dtSearch() returns parent directory page pinned)
+ */
+ if ((rc = get_UCSname(&dname, dentry)))
+ goto out1;
+
+ /*
+ * Either iAlloc() or txBegin() may block. Deadlock can occur if we
+ * block there while holding dtree page, so we allocate the inode &
+ * begin the transaction before we search the directory.
+ */
+ ip = ialloc(dip, S_IFDIR | mode);
+ if (ip == NULL) {
+ rc = -ENOSPC;
+ goto out2;
+ }
+
+ tid = txBegin(dip->i_sb, 0);
+
+ down(&JFS_IP(dip)->commit_sem);
+ down(&JFS_IP(ip)->commit_sem);
+
+ if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
+ jfs_err("jfs_mkdir: dtSearch returned %d", rc);
+ goto out3;
+ }
+
+ tblk = tid_to_tblock(tid);
+ tblk->xflag |= COMMIT_CREATE;
+ tblk->ino = ip->i_ino;
+ tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
+
+ iplist[0] = dip;
+ iplist[1] = ip;
+
+ /*
+ * initialize the child directory in-line in inode
+ */
+ dtInitRoot(tid, ip, dip->i_ino);
+
+ /*
+ * create entry in parent directory for child directory
+ * (dtInsert() releases parent directory page)
+ */
+ ino = ip->i_ino;
+ if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
+ if (rc == -EIO) {
+ jfs_err("jfs_mkdir: dtInsert returned -EIO");
+ txAbort(tid, 1); /* Marks Filesystem dirty */
+ } else
+ txAbort(tid, 0); /* Filesystem full */
+ goto out3;
+ }
+
+ ip->i_nlink = 2; /* for '.' */
+ ip->i_op = &jfs_dir_inode_operations;
+ ip->i_fop = &jfs_dir_operations;
+
+ insert_inode_hash(ip);
+ mark_inode_dirty(ip);
+
+ /* update parent directory inode */
+ dip->i_nlink++; /* for '..' from child directory */
+ dip->i_ctime = dip->i_mtime = CURRENT_TIME;
+ mark_inode_dirty(dip);
+
+ rc = txCommit(tid, 2, &iplist[0], 0);
+
+ out3:
+ txEnd(tid);
+ up(&JFS_IP(dip)->commit_sem);
+ up(&JFS_IP(ip)->commit_sem);
+ if (rc) {
+ ip->i_nlink = 0;
+ iput(ip);
+ } else
+ d_instantiate(dentry, ip);
+
+ out2:
+ free_UCSname(&dname);
+
+#ifdef CONFIG_JFS_POSIX_ACL
+ if (rc == 0)
+ jfs_init_acl(ip, dip);
+#endif
+
+ out1:
+
+ jfs_info("jfs_mkdir: rc:%d", rc);
+ return rc;
+}
+
+/*
+ * NAME: jfs_rmdir(dip, dentry)
+ *
+ * FUNCTION: remove a link to child directory
+ *
+ * PARAMETER: dip - parent inode
+ * dentry - child directory dentry
+ *
+ * RETURN: -EINVAL - if name is . or ..
+ * -EINVAL - if . or .. exist but are invalid.
+ * errors from subroutines
+ *
+ * note:
+ * if other threads have the directory open when the last link
+ * is removed, the "." and ".." entries, if present, are removed before
+ * rmdir() returns and no new entries may be created in the directory,
+ * but the directory is not removed until the last reference to
+ * the directory is released (cf.unlink() of regular file).
+ */
+static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
+{
+ int rc;
+ tid_t tid; /* transaction id */
+ struct inode *ip = dentry->d_inode;
+ ino_t ino;
+ struct component_name dname;
+ struct inode *iplist[2];
+ struct tblock *tblk;
+
+ jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name);
+
+ /* Init inode for quota operations. */
+ DQUOT_INIT(ip);
+
+ /* directory must be empty to be removed */
+ if (!dtEmpty(ip)) {
+ rc = -ENOTEMPTY;
+ goto out;
+ }
+
+ if ((rc = get_UCSname(&dname, dentry))) {
+ goto out;
+ }
+
+ tid = txBegin(dip->i_sb, 0);
+
+ down(&JFS_IP(dip)->commit_sem);
+ down(&JFS_IP(ip)->commit_sem);
+
+ iplist[0] = dip;
+ iplist[1] = ip;
+
+ tblk = tid_to_tblock(tid);
+ tblk->xflag |= COMMIT_DELETE;
+ tblk->u.ip = ip;
+
+ /*
+ * delete the entry of target directory from parent directory
+ */
+ ino = ip->i_ino;
+ if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
+ jfs_err("jfs_rmdir: dtDelete returned %d", rc);
+ if (rc == -EIO)
+ txAbort(tid, 1);
+ txEnd(tid);
+ up(&JFS_IP(dip)->commit_sem);
+ up(&JFS_IP(ip)->commit_sem);
+
+ goto out2;
+ }
+
+ /* update parent directory's link count corresponding
+ * to ".." entry of the target directory deleted
+ */
+ dip->i_nlink--;
+ dip->i_ctime = dip->i_mtime = CURRENT_TIME;
+ mark_inode_dirty(dip);
+
+ /*
+ * OS/2 could have created EA and/or ACL
+ */
+ /* free EA from both persistent and working map */
+ if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
+ /* free EA pages */
+ txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
+ }
+ JFS_IP(ip)->ea.flag = 0;
+
+ /* free ACL from both persistent and working map */
+ if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
+ /* free ACL pages */
+ txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
+ }
+ JFS_IP(ip)->acl.flag = 0;
+
+ /* mark the target directory as deleted */
+ ip->i_nlink = 0;
+ mark_inode_dirty(ip);
+
+ rc = txCommit(tid, 2, &iplist[0], 0);
+
+ txEnd(tid);
+
+ up(&JFS_IP(dip)->commit_sem);
+ up(&JFS_IP(ip)->commit_sem);
+
+ /*
+ * Truncating the directory index table is not guaranteed. It
+ * may need to be done iteratively
+ */
+ if (test_cflag(COMMIT_Stale, dip)) {
+ if (dip->i_size > 1)
+ jfs_truncate_nolock(dip, 0);
+
+ clear_cflag(COMMIT_Stale, dip);
+ }
+
+ out2:
+ free_UCSname(&dname);
+
+ out:
+ jfs_info("jfs_rmdir: rc:%d", rc);
+ return rc;
+}
+
+/*
+ * NAME: jfs_unlink(dip, dentry)
+ *
+ * FUNCTION: remove a link to object <vp> named by <name>
+ * from parent directory <dvp>
+ *
+ * PARAMETER: dip - inode of parent directory
+ * dentry - dentry of object to be removed
+ *
+ * RETURN: errors from subroutines
+ *
+ * note:
+ * temporary file: if one or more processes have the file open
+ * when the last link is removed, the link will be removed before
+ * unlink() returns, but the removal of the file contents will be
+ * postponed until all references to the files are closed.
+ *
+ * JFS does NOT support unlink() on directories.
+ *
+ */
+static int jfs_unlink(struct inode *dip, struct dentry *dentry)
+{
+ int rc;
+ tid_t tid; /* transaction id */
+ struct inode *ip = dentry->d_inode;
+ ino_t ino;
+ struct component_name dname; /* object name */
+ struct inode *iplist[2];
+ struct tblock *tblk;
+ s64 new_size = 0;
+ int commit_flag;
+
+ jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name);
+
+ /* Init inode for quota operations. */
+ DQUOT_INIT(ip);
+
+ if ((rc = get_UCSname(&dname, dentry)))
+ goto out;
+
+ IWRITE_LOCK(ip);
+
+ tid = txBegin(dip->i_sb, 0);
+
+ down(&JFS_IP(dip)->commit_sem);
+ down(&JFS_IP(ip)->commit_sem);
+
+ iplist[0] = dip;
+ iplist[1] = ip;
+
+ /*
+ * delete the entry of target file from parent directory
+ */
+ ino = ip->i_ino;
+ if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
+ jfs_err("jfs_unlink: dtDelete returned %d", rc);
+ if (rc == -EIO)
+ txAbort(tid, 1); /* Marks FS Dirty */
+ txEnd(tid);
+ up(&JFS_IP(dip)->commit_sem);
+ up(&JFS_IP(ip)->commit_sem);
+ IWRITE_UNLOCK(ip);
+ goto out1;
+ }
+
+ ASSERT(ip->i_nlink);
+
+ ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME;
+ mark_inode_dirty(dip);
+
+ /* update target's inode */
+ ip->i_nlink--;
+ mark_inode_dirty(ip);
+
+ /*
+ * commit zero link count object
+ */
+ if (ip->i_nlink == 0) {
+ assert(!test_cflag(COMMIT_Nolink, ip));
+ /* free block resources */
+ if ((new_size = commitZeroLink(tid, ip)) < 0) {
+ txAbort(tid, 1); /* Marks FS Dirty */
+ txEnd(tid);
+ up(&JFS_IP(dip)->commit_sem);
+ up(&JFS_IP(ip)->commit_sem);
+ IWRITE_UNLOCK(ip);
+ rc = new_size;
+ goto out1;
+ }
+ tblk = tid_to_tblock(tid);
+ tblk->xflag |= COMMIT_DELETE;
+ tblk->u.ip = ip;
+ }
+
+ /*
+ * Incomplete truncate of file data can
+ * result in timing problems unless we synchronously commit the
+ * transaction.
+ */
+ if (new_size)
+ commit_flag = COMMIT_SYNC;
+ else
+ commit_flag = 0;
+
+ /*
+ * If xtTruncate was incomplete, commit synchronously to avoid
+ * timing complications
+ */
+ rc = txCommit(tid, 2, &iplist[0], commit_flag);
+
+ txEnd(tid);
+
+ up(&JFS_IP(dip)->commit_sem);
+ up(&JFS_IP(ip)->commit_sem);
+
+
+ while (new_size && (rc == 0)) {
+ tid = txBegin(dip->i_sb, 0);
+ down(&JFS_IP(ip)->commit_sem);
+ new_size = xtTruncate_pmap(tid, ip, new_size);
+ if (new_size < 0) {
+ txAbort(tid, 1); /* Marks FS Dirty */
+ rc = new_size;
+ } else
+ rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
+ txEnd(tid);
+ up(&JFS_IP(ip)->commit_sem);
+ }
+
+ if (ip->i_nlink == 0)
+ set_cflag(COMMIT_Nolink, ip);
+
+ IWRITE_UNLOCK(ip);
+
+ /*
+ * Truncating the directory index table is not guaranteed. It
+ * may need to be done iteratively
+ */
+ if (test_cflag(COMMIT_Stale, dip)) {
+ if (dip->i_size > 1)
+ jfs_truncate_nolock(dip, 0);
+
+ clear_cflag(COMMIT_Stale, dip);
+ }
+
+ out1:
+ free_UCSname(&dname);
+ out:
+ jfs_info("jfs_unlink: rc:%d", rc);
+ return rc;
+}
+
+/*
+ * NAME: commitZeroLink()
+ *
+ * FUNCTION: for non-directory, called by jfs_remove(),
+ * truncate a regular file, directory or symbolic
+ * link to zero length. return 0 if type is not
+ * one of these.
+ *
+ * if the file is currently associated with a VM segment
+ * only permanent disk and inode map resources are freed,
+ * and neither the inode nor indirect blocks are modified
+ * so that the resources can be later freed in the work
+ * map by ctrunc1.
+ * if there is no VM segment on entry, the resources are
+ * freed in both work and permanent map.
+ * (? for temporary file - memory object is cached even
+ * after no reference:
+ * reference count > 0 - )
+ *
+ * PARAMETERS: cd - pointer to commit data structure.
+ * current inode is the one to truncate.
+ *
+ * RETURN: Errors from subroutines
+ */
+static s64 commitZeroLink(tid_t tid, struct inode *ip)
+{
+ int filetype;
+ struct tblock *tblk;
+
+ jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
+
+ filetype = ip->i_mode & S_IFMT;
+ switch (filetype) {
+ case S_IFREG:
+ break;
+ case S_IFLNK:
+ /* fast symbolic link */
+ if (ip->i_size < IDATASIZE) {
+ ip->i_size = 0;
+ return 0;
+ }
+ break;
+ default:
+ assert(filetype != S_IFDIR);
+ return 0;
+ }
+
+ set_cflag(COMMIT_Freewmap, ip);
+
+ /* mark transaction of block map update type */
+ tblk = tid_to_tblock(tid);
+ tblk->xflag |= COMMIT_PMAP;
+
+ /*
+ * free EA
+ */
+ if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
+ /* acquire maplock on EA to be freed from block map */
+ txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
+
+ /*
+ * free ACL
+ */
+ if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
+ /* acquire maplock on EA to be freed from block map */
+ txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
+
+ /*
+ * free xtree/data (truncate to zero length):
+ * free xtree/data pages from cache if COMMIT_PWMAP,
+ * free xtree/data blocks from persistent block map, and
+ * free xtree/data blocks from working block map if COMMIT_PWMAP;
+ */
+ if (ip->i_size)
+ return xtTruncate_pmap(tid, ip, 0);
+
+ return 0;
+}
+
+
+/*
+ * NAME: freeZeroLink()
+ *
+ * FUNCTION: for non-directory, called by iClose(),
+ * free resources of a file from cache and WORKING map
+ * for a file previously committed with zero link count
+ * while associated with a pager object,
+ *
+ * PARAMETER: ip - pointer to inode of file.
+ *
+ * RETURN: 0 -ok
+ */
+int freeZeroLink(struct inode *ip)
+{
+ int rc = 0;
+ int type;
+
+ jfs_info("freeZeroLink: ip = 0x%p", ip);
+
+ /* return if not reg or symbolic link or if size is
+ * already ok.
+ */
+ type = ip->i_mode & S_IFMT;
+
+ switch (type) {
+ case S_IFREG:
+ break;
+ case S_IFLNK:
+ /* if its contained in inode nothing to do */
+ if (ip->i_size < IDATASIZE)
+ return 0;
+ break;
+ default:
+ return 0;
+ }
+
+ /*
+ * free EA
+ */
+ if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
+ s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
+ int xlen = lengthDXD(&JFS_IP(ip)->ea);
+ struct maplock maplock; /* maplock for COMMIT_WMAP */
+ struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
+
+ /* free EA pages from cache */
+ invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
+
+ /* free EA extent from working block map */
+ maplock.index = 1;
+ pxdlock = (struct pxd_lock *) & maplock;
+ pxdlock->flag = mlckFREEPXD;
+ PXDaddress(&pxdlock->pxd, xaddr);
+ PXDlength(&pxdlock->pxd, xlen);
+ txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
+ }
+
+ /*
+ * free ACL
+ */
+ if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
+ s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
+ int xlen = lengthDXD(&JFS_IP(ip)->acl);
+ struct maplock maplock; /* maplock for COMMIT_WMAP */
+ struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
+
+ invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
+
+ /* free ACL extent from working block map */
+ maplock.index = 1;
+ pxdlock = (struct pxd_lock *) & maplock;
+ pxdlock->flag = mlckFREEPXD;
+ PXDaddress(&pxdlock->pxd, xaddr);
+ PXDlength(&pxdlock->pxd, xlen);
+ txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
+ }
+
+ /*
+ * free xtree/data (truncate to zero length):
+ * free xtree/data pages from cache, and
+ * free xtree/data blocks from working block map;
+ */
+ if (ip->i_size)
+ rc = xtTruncate(0, ip, 0, COMMIT_WMAP);
+
+ return rc;
+}
+
+/*
+ * NAME: jfs_link(vp, dvp, name, crp)
+ *
+ * FUNCTION: create a link to <vp> by the name = <name>
+ * in the parent directory <dvp>
+ *
+ * PARAMETER: vp - target object
+ * dvp - parent directory of new link
+ * name - name of new link to target object
+ * crp - credential
+ *
+ * RETURN: Errors from subroutines
+ *
+ * note:
+ * JFS does NOT support link() on directories (to prevent circular
+ * path in the directory hierarchy);
+ * EPERM: the target object is a directory, and either the caller
+ * does not have appropriate privileges or the implementation prohibits
+ * using link() on directories [XPG4.2].
+ *
+ * JFS does NOT support links between file systems:
+ * EXDEV: target object and new link are on different file systems and
+ * implementation does not support links between file systems [XPG4.2].
+ */
+static int jfs_link(struct dentry *old_dentry,
+ struct inode *dir, struct dentry *dentry)
+{
+ int rc;
+ tid_t tid;
+ struct inode *ip = old_dentry->d_inode;
+ ino_t ino;
+ struct component_name dname;
+ struct btstack btstack;
+ struct inode *iplist[2];
+
+ jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
+ dentry->d_name.name);
+
+ if (ip->i_nlink == JFS_LINK_MAX)
+ return -EMLINK;
+
+ if (ip->i_nlink == 0)
+ return -ENOENT;
+
+ tid = txBegin(ip->i_sb, 0);
+
+ down(&JFS_IP(dir)->commit_sem);
+ down(&JFS_IP(ip)->commit_sem);
+
+ /*
+ * scan parent directory for entry/freespace
+ */
+ if ((rc = get_UCSname(&dname, dentry)))
+ goto out;
+
+ if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
+ goto free_dname;
+
+ /*
+ * create entry for new link in parent directory
+ */
+ ino = ip->i_ino;
+ if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
+ goto free_dname;
+
+ /* update object inode */
+ ip->i_nlink++; /* for new link */
+ ip->i_ctime = CURRENT_TIME;
+ mark_inode_dirty(dir);
+ atomic_inc(&ip->i_count);
+
+ iplist[0] = ip;
+ iplist[1] = dir;
+ rc = txCommit(tid, 2, &iplist[0], 0);
+
+ if (rc) {
+ ip->i_nlink--;
+ iput(ip);
+ } else
+ d_instantiate(dentry, ip);
+
+ free_dname:
+ free_UCSname(&dname);
+
+ out:
+ txEnd(tid);
+
+ up(&JFS_IP(dir)->commit_sem);
+ up(&JFS_IP(ip)->commit_sem);
+
+ jfs_info("jfs_link: rc:%d", rc);
+ return rc;
+}
+
+/*
+ * NAME: jfs_symlink(dip, dentry, name)
+ *
+ * FUNCTION: creates a symbolic link to <symlink> by name <name>
+ * in directory <dip>
+ *
+ * PARAMETER: dip - parent directory vnode
+ * dentry - dentry of symbolic link
+ * name - the path name of the existing object
+ * that will be the source of the link
+ *
+ * RETURN: errors from subroutines
+ *
+ * note:
+ * ENAMETOOLONG: pathname resolution of a symbolic link produced
+ * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
+*/
+
+static int jfs_symlink(struct inode *dip, struct dentry *dentry,
+ const char *name)
+{
+ int rc;
+ tid_t tid;
+ ino_t ino = 0;
+ struct component_name dname;
+ int ssize; /* source pathname size */
+ struct btstack btstack;
+ struct inode *ip = dentry->d_inode;
+ unchar *i_fastsymlink;
+ s64 xlen = 0;
+ int bmask = 0, xsize;
+ s64 extent = 0, xaddr;
+ struct metapage *mp;
+ struct super_block *sb;
+ struct tblock *tblk;
+
+ struct inode *iplist[2];
+
+ jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
+
+ ssize = strlen(name) + 1;
+
+ /*
+ * search parent directory for entry/freespace
+ * (dtSearch() returns parent directory page pinned)
+ */
+
+ if ((rc = get_UCSname(&dname, dentry)))
+ goto out1;
+
+ /*
+ * allocate on-disk/in-memory inode for symbolic link:
+ * (iAlloc() returns new, locked inode)
+ */
+ ip = ialloc(dip, S_IFLNK | 0777);
+ if (ip == NULL) {
+ rc = -ENOSPC;
+ goto out2;
+ }
+
+ tid = txBegin(dip->i_sb, 0);
+
+ down(&JFS_IP(dip)->commit_sem);
+ down(&JFS_IP(ip)->commit_sem);
+
+ tblk = tid_to_tblock(tid);
+ tblk->xflag |= COMMIT_CREATE;
+ tblk->ino = ip->i_ino;
+ tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
+
+ /* fix symlink access permission
+ * (dir_create() ANDs in the u.u_cmask,
+ * but symlinks really need to be 777 access)
+ */
+ ip->i_mode |= 0777;
+
+ /*
+ * write symbolic link target path name
+ */
+ xtInitRoot(tid, ip);
+
+ /*
+ * write source path name inline in on-disk inode (fast symbolic link)
+ */
+
+ if (ssize <= IDATASIZE) {
+ ip->i_op = &jfs_symlink_inode_operations;
+
+ i_fastsymlink = JFS_IP(ip)->i_inline;
+ memcpy(i_fastsymlink, name, ssize);
+ ip->i_size = ssize - 1;
+
+ /*
+ * if symlink is > 128 bytes, we don't have the space to
+ * store inline extended attributes
+ */
+ if (ssize > sizeof (JFS_IP(ip)->i_inline))
+ JFS_IP(ip)->mode2 &= ~INLINEEA;
+
+ jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ",
+ ssize, name);
+ }
+ /*
+ * write source path name in a single extent
+ */
+ else {
+ jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
+
+ ip->i_op = &page_symlink_inode_operations;
+ ip->i_mapping->a_ops = &jfs_aops;
+
+ /*
+ * even though the data of symlink object (source
+ * path name) is treated as non-journaled user data,
+ * it is read/written thru buffer cache for performance.
+ */
+ sb = ip->i_sb;
+ bmask = JFS_SBI(sb)->bsize - 1;
+ xsize = (ssize + bmask) & ~bmask;
+ xaddr = 0;
+ xlen = xsize >> JFS_SBI(sb)->l2bsize;
+ if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
+ txAbort(tid, 0);
+ rc = -ENOSPC;
+ goto out3;
+ }
+ extent = xaddr;
+ ip->i_size = ssize - 1;
+ while (ssize) {
+ /* This is kind of silly since PATH_MAX == 4K */
+ int copy_size = min(ssize, PSIZE);
+
+ mp = get_metapage(ip, xaddr, PSIZE, 1);
+
+ if (mp == NULL) {
+ xtTruncate(tid, ip, 0, COMMIT_PWMAP);
+ rc = -EIO;
+ txAbort(tid, 0);
+ goto out3;
+ }
+ memcpy(mp->data, name, copy_size);
+ flush_metapage(mp);
+ ssize -= copy_size;
+ name += copy_size;
+ xaddr += JFS_SBI(sb)->nbperpage;
+ }
+ }
+
+ /*
+ * create entry for symbolic link in parent directory
+ */
+ rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
+ if (rc == 0) {
+ ino = ip->i_ino;
+ rc = dtInsert(tid, dip, &dname, &ino, &btstack);
+ }
+ if (rc) {
+ if (xlen)
+ xtTruncate(tid, ip, 0, COMMIT_PWMAP);
+ txAbort(tid, 0);
+ /* discard new inode */
+ goto out3;
+ }
+
+ insert_inode_hash(ip);
+ mark_inode_dirty(ip);
+
+ /*
+ * commit update of parent directory and link object
+ */
+
+ iplist[0] = dip;
+ iplist[1] = ip;
+ rc = txCommit(tid, 2, &iplist[0], 0);
+
+ out3:
+ txEnd(tid);
+ up(&JFS_IP(dip)->commit_sem);
+ up(&JFS_IP(ip)->commit_sem);
+ if (rc) {
+ ip->i_nlink = 0;
+ iput(ip);
+ } else
+ d_instantiate(dentry, ip);
+
+ out2:
+ free_UCSname(&dname);
+
+#ifdef CONFIG_JFS_POSIX_ACL
+ if (rc == 0)
+ jfs_init_acl(ip, dip);
+#endif
+
+ out1:
+ jfs_info("jfs_symlink: rc:%d", rc);
+ return rc;
+}
+
+
+/*
+ * NAME: jfs_rename
+ *
+ * FUNCTION: rename a file or directory
+ */
+static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
+{
+ struct btstack btstack;
+ ino_t ino;
+ struct component_name new_dname;
+ struct inode *new_ip;
+ struct component_name old_dname;
+ struct inode *old_ip;
+ int rc;
+ tid_t tid;
+ struct tlock *tlck;
+ struct dt_lock *dtlck;
+ struct lv *lv;
+ int ipcount;
+ struct inode *iplist[4];
+ struct tblock *tblk;
+ s64 new_size = 0;
+ int commit_flag;
+
+
+ jfs_info("jfs_rename: %s %s", old_dentry->d_name.name,
+ new_dentry->d_name.name);
+
+ old_ip = old_dentry->d_inode;
+ new_ip = new_dentry->d_inode;
+
+ if ((rc = get_UCSname(&old_dname, old_dentry)))
+ goto out1;
+
+ if ((rc = get_UCSname(&new_dname, new_dentry)))
+ goto out2;
+
+ /*
+ * Make sure source inode number is what we think it is
+ */
+ rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
+ if (rc || (ino != old_ip->i_ino)) {
+ rc = -ENOENT;
+ goto out3;
+ }
+
+ /*
+ * Make sure dest inode number (if any) is what we think it is
+ */
+ rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
+ if (rc == 0) {
+ if ((new_ip == 0) || (ino != new_ip->i_ino)) {
+ rc = -ESTALE;
+ goto out3;
+ }
+ } else if (rc != -ENOENT)
+ goto out3;
+ else if (new_ip) {
+ /* no entry exists, but one was expected */
+ rc = -ESTALE;
+ goto out3;
+ }
+
+ if (S_ISDIR(old_ip->i_mode)) {
+ if (new_ip) {
+ if (!dtEmpty(new_ip)) {
+ rc = -ENOTEMPTY;
+ goto out3;
+ }
+ } else if ((new_dir != old_dir) &&
+ (new_dir->i_nlink == JFS_LINK_MAX)) {
+ rc = -EMLINK;
+ goto out3;
+ }
+ } else if (new_ip) {
+ IWRITE_LOCK(new_ip);
+ /* Init inode for quota operations. */
+ DQUOT_INIT(new_ip);
+ }
+
+ /*
+ * The real work starts here
+ */
+ tid = txBegin(new_dir->i_sb, 0);
+
+ down(&JFS_IP(new_dir)->commit_sem);
+ down(&JFS_IP(old_ip)->commit_sem);
+ if (old_dir != new_dir)
+ down(&JFS_IP(old_dir)->commit_sem);
+
+ if (new_ip) {
+ down(&JFS_IP(new_ip)->commit_sem);
+ /*
+ * Change existing directory entry to new inode number
+ */
+ ino = new_ip->i_ino;
+ rc = dtModify(tid, new_dir, &new_dname, &ino,
+ old_ip->i_ino, JFS_RENAME);
+ if (rc)
+ goto out4;
+ new_ip->i_nlink--;
+ if (S_ISDIR(new_ip->i_mode)) {
+ new_ip->i_nlink--;
+ if (new_ip->i_nlink) {
+ up(&JFS_IP(new_dir)->commit_sem);
+ up(&JFS_IP(old_ip)->commit_sem);
+ if (old_dir != new_dir)
+ up(&JFS_IP(old_dir)->commit_sem);
+ if (!S_ISDIR(old_ip->i_mode) && new_ip)
+ IWRITE_UNLOCK(new_ip);
+ jfs_error(new_ip->i_sb,
+ "jfs_rename: new_ip->i_nlink != 0");
+ return -EIO;
+ }
+ tblk = tid_to_tblock(tid);
+ tblk->xflag |= COMMIT_DELETE;
+ tblk->u.ip = new_ip;
+ } else if (new_ip->i_nlink == 0) {
+ assert(!test_cflag(COMMIT_Nolink, new_ip));
+ /* free block resources */
+ if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
+ txAbort(tid, 1); /* Marks FS Dirty */
+ rc = new_size;
+ goto out4;
+ }
+ tblk = tid_to_tblock(tid);
+ tblk->xflag |= COMMIT_DELETE;
+ tblk->u.ip = new_ip;
+ } else {
+ new_ip->i_ctime = CURRENT_TIME;
+ mark_inode_dirty(new_ip);
+ }
+ } else {
+ /*
+ * Add new directory entry
+ */
+ rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
+ JFS_CREATE);
+ if (rc) {
+ jfs_err("jfs_rename didn't expect dtSearch to fail "
+ "w/rc = %d", rc);
+ goto out4;
+ }
+
+ ino = old_ip->i_ino;
+ rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
+ if (rc) {
+ if (rc == -EIO)
+ jfs_err("jfs_rename: dtInsert returned -EIO");
+ goto out4;
+ }
+ if (S_ISDIR(old_ip->i_mode))
+ new_dir->i_nlink++;
+ }
+ /*
+ * Remove old directory entry
+ */
+
+ ino = old_ip->i_ino;
+ rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
+ if (rc) {
+ jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
+ rc);
+ txAbort(tid, 1); /* Marks Filesystem dirty */
+ goto out4;
+ }
+ if (S_ISDIR(old_ip->i_mode)) {
+ old_dir->i_nlink--;
+ if (old_dir != new_dir) {
+ /*
+ * Change inode number of parent for moved directory
+ */
+
+ JFS_IP(old_ip)->i_dtroot.header.idotdot =
+ cpu_to_le32(new_dir->i_ino);
+
+ /* Linelock header of dtree */
+ tlck = txLock(tid, old_ip,
+ (struct metapage *) &JFS_IP(old_ip)->bxflag,
+ tlckDTREE | tlckBTROOT | tlckRELINK);
+ dtlck = (struct dt_lock *) & tlck->lock;
+ ASSERT(dtlck->index == 0);
+ lv = & dtlck->lv[0];
+ lv->offset = 0;
+ lv->length = 1;
+ dtlck->index++;
+ }
+ }
+
+ /*
+ * Update ctime on changed/moved inodes & mark dirty
+ */
+ old_ip->i_ctime = CURRENT_TIME;
+ mark_inode_dirty(old_ip);
+
+ new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
+ mark_inode_dirty(new_dir);
+
+ /* Build list of inodes modified by this transaction */
+ ipcount = 0;
+ iplist[ipcount++] = old_ip;
+ if (new_ip)
+ iplist[ipcount++] = new_ip;
+ iplist[ipcount++] = old_dir;
+
+ if (old_dir != new_dir) {
+ iplist[ipcount++] = new_dir;
+ old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
+ mark_inode_dirty(old_dir);
+ }
+
+ /*
+ * Incomplete truncate of file data can
+ * result in timing problems unless we synchronously commit the
+ * transaction.
+ */
+ if (new_size)
+ commit_flag = COMMIT_SYNC;
+ else
+ commit_flag = 0;
+
+ rc = txCommit(tid, ipcount, iplist, commit_flag);
+
+ out4:
+ txEnd(tid);
+
+ up(&JFS_IP(new_dir)->commit_sem);
+ up(&JFS_IP(old_ip)->commit_sem);
+ if (old_dir != new_dir)
+ up(&JFS_IP(old_dir)->commit_sem);
+ if (new_ip)
+ up(&JFS_IP(new_ip)->commit_sem);
+
+ while (new_size && (rc == 0)) {
+ tid = txBegin(new_ip->i_sb, 0);
+ down(&JFS_IP(new_ip)->commit_sem);
+ new_size = xtTruncate_pmap(tid, new_ip, new_size);
+ if (new_size < 0) {
+ txAbort(tid, 1);
+ rc = new_size;
+ } else
+ rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
+ txEnd(tid);
+ up(&JFS_IP(new_ip)->commit_sem);
+ }
+ if (new_ip && (new_ip->i_nlink == 0))
+ set_cflag(COMMIT_Nolink, new_ip);
+ out3:
+ free_UCSname(&new_dname);
+ out2:
+ free_UCSname(&old_dname);
+ out1:
+ if (new_ip && !S_ISDIR(new_ip->i_mode))
+ IWRITE_UNLOCK(new_ip);
+ /*
+ * Truncating the directory index table is not guaranteed. It
+ * may need to be done iteratively
+ */
+ if (test_cflag(COMMIT_Stale, old_dir)) {
+ if (old_dir->i_size > 1)
+ jfs_truncate_nolock(old_dir, 0);
+
+ clear_cflag(COMMIT_Stale, old_dir);
+ }
+
+ jfs_info("jfs_rename: returning %d", rc);
+ return rc;
+}
+
+
+/*
+ * NAME: jfs_mknod
+ *
+ * FUNCTION: Create a special file (device)
+ */
+static int jfs_mknod(struct inode *dir, struct dentry *dentry,
+ int mode, dev_t rdev)
+{
+ struct jfs_inode_info *jfs_ip;
+ struct btstack btstack;
+ struct component_name dname;
+ ino_t ino;
+ struct inode *ip;
+ struct inode *iplist[2];
+ int rc;
+ tid_t tid;
+ struct tblock *tblk;
+
+ if (!new_valid_dev(rdev))
+ return -EINVAL;
+
+ jfs_info("jfs_mknod: %s", dentry->d_name.name);
+
+ if ((rc = get_UCSname(&dname, dentry)))
+ goto out;
+
+ ip = ialloc(dir, mode);
+ if (ip == NULL) {
+ rc = -ENOSPC;
+ goto out1;
+ }
+ jfs_ip = JFS_IP(ip);
+
+ tid = txBegin(dir->i_sb, 0);
+
+ down(&JFS_IP(dir)->commit_sem);
+ down(&JFS_IP(ip)->commit_sem);
+
+ if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
+ goto out3;
+
+ tblk = tid_to_tblock(tid);
+ tblk->xflag |= COMMIT_CREATE;
+ tblk->ino = ip->i_ino;
+ tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
+
+ ino = ip->i_ino;
+ if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
+ goto out3;
+
+ ip->i_op = &jfs_file_inode_operations;
+ jfs_ip->dev = new_encode_dev(rdev);
+ init_special_inode(ip, ip->i_mode, rdev);
+
+ insert_inode_hash(ip);
+ mark_inode_dirty(ip);
+
+ dir->i_ctime = dir->i_mtime = CURRENT_TIME;
+
+ mark_inode_dirty(dir);
+
+ iplist[0] = dir;
+ iplist[1] = ip;
+ rc = txCommit(tid, 2, iplist, 0);
+
+ out3:
+ txEnd(tid);
+ up(&JFS_IP(ip)->commit_sem);
+ up(&JFS_IP(dir)->commit_sem);
+ if (rc) {
+ ip->i_nlink = 0;
+ iput(ip);
+ } else
+ d_instantiate(dentry, ip);
+
+ out1:
+ free_UCSname(&dname);
+
+#ifdef CONFIG_JFS_POSIX_ACL
+ if (rc == 0)
+ jfs_init_acl(ip, dir);
+#endif
+
+ out:
+ jfs_info("jfs_mknod: returning %d", rc);
+ return rc;
+}
+
+static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd)
+{
+ struct btstack btstack;
+ ino_t inum;
+ struct inode *ip;
+ struct component_name key;
+ const char *name = dentry->d_name.name;
+ int len = dentry->d_name.len;
+ int rc;
+
+ jfs_info("jfs_lookup: name = %s", name);
+
+
+ if ((name[0] == '.') && (len == 1))
+ inum = dip->i_ino;
+ else if (strcmp(name, "..") == 0)
+ inum = PARENT(dip);
+ else {
+ if ((rc = get_UCSname(&key, dentry)))
+ return ERR_PTR(rc);
+ rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
+ free_UCSname(&key);
+ if (rc == -ENOENT) {
+ d_add(dentry, NULL);
+ return ERR_PTR(0);
+ } else if (rc) {
+ jfs_err("jfs_lookup: dtSearch returned %d", rc);
+ return ERR_PTR(rc);
+ }
+ }
+
+ ip = iget(dip->i_sb, inum);
+ if (ip == NULL || is_bad_inode(ip)) {
+ jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
+ if (ip)
+ iput(ip);
+ return ERR_PTR(-EACCES);
+ }
+
+ if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)
+ dentry->d_op = &jfs_ci_dentry_operations;
+
+ dentry = d_splice_alias(ip, dentry);
+
+ if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2))
+ dentry->d_op = &jfs_ci_dentry_operations;
+
+ return dentry;
+}
+
+struct dentry *jfs_get_parent(struct dentry *dentry)
+{
+ struct super_block *sb = dentry->d_inode->i_sb;
+ struct dentry *parent = ERR_PTR(-ENOENT);
+ struct inode *inode;
+ unsigned long parent_ino;
+
+ parent_ino =
+ le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
+ inode = iget(sb, parent_ino);
+ if (inode) {
+ if (is_bad_inode(inode)) {
+ iput(inode);
+ parent = ERR_PTR(-EACCES);
+ } else {
+ parent = d_alloc_anon(inode);
+ if (!parent) {
+ parent = ERR_PTR(-ENOMEM);
+ iput(inode);
+ }
+ }
+ }
+
+ return parent;
+}
+
+struct inode_operations jfs_dir_inode_operations = {
+ .create = jfs_create,
+ .lookup = jfs_lookup,
+ .link = jfs_link,
+ .unlink = jfs_unlink,
+ .symlink = jfs_symlink,
+ .mkdir = jfs_mkdir,
+ .rmdir = jfs_rmdir,
+ .mknod = jfs_mknod,
+ .rename = jfs_rename,
+ .setxattr = jfs_setxattr,
+ .getxattr = jfs_getxattr,
+ .listxattr = jfs_listxattr,
+ .removexattr = jfs_removexattr,
+#ifdef CONFIG_JFS_POSIX_ACL
+ .setattr = jfs_setattr,
+ .permission = jfs_permission,
+#endif
+};
+
+struct file_operations jfs_dir_operations = {
+ .read = generic_read_dir,
+ .readdir = jfs_readdir,
+ .fsync = jfs_fsync,
+};
+
+static int jfs_ci_hash(struct dentry *dir, struct qstr *this)
+{
+ unsigned long hash;
+ int i;
+
+ hash = init_name_hash();
+ for (i=0; i < this->len; i++)
+ hash = partial_name_hash(tolower(this->name[i]), hash);
+ this->hash = end_name_hash(hash);
+
+ return 0;
+}
+
+static int jfs_ci_compare(struct dentry *dir, struct qstr *a, struct qstr *b)
+{
+ int i, result = 1;
+
+ if (a->len != b->len)
+ goto out;
+ for (i=0; i < a->len; i++) {
+ if (tolower(a->name[i]) != tolower(b->name[i]))
+ goto out;
+ }
+ result = 0;
+
+ /*
+ * We want creates to preserve case. A negative dentry, a, that
+ * has a different case than b may cause a new entry to be created
+ * with the wrong case. Since we can't tell if a comes from a negative
+ * dentry, we blindly replace it with b. This should be harmless if
+ * a is not a negative dentry.
+ */
+ memcpy((unsigned char *)a->name, b->name, a->len);
+out:
+ return result;
+}
+
+struct dentry_operations jfs_ci_dentry_operations =
+{
+ .d_hash = jfs_ci_hash,
+ .d_compare = jfs_ci_compare,
+};