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[JFFS2] Add symlink caching support.

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Signed-off-by: Artem B. Bityuckiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Artem B. Bityuckiy
2005-03-01 10:50:52 +00:00
committed by Thomas Gleixner
parent 20a6c21190
commit 32f1a95d50
5 changed files with 117 additions and 70 deletions
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54
fs/jffs2/readinode.c
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@@ -7,7 +7,7 @@
*
* For licensing information, see the file 'LICENCE' in this directory.
*
* $Id: readinode.c,v 1.118 2005/02/27 23:01:33 dwmw2 Exp $
* $Id: readinode.c,v 1.119 2005/03/01 10:34:03 dedekind Exp $
*
*/
@@ -623,6 +623,40 @@ static int jffs2_do_read_inode_internal(struct jffs2_sb_info *c,
case. */
if (!je32_to_cpu(latest_node->isize))
latest_node->isize = latest_node->dsize;
if (f->inocache->state != INO_STATE_CHECKING) {
/* Symlink's inode data is the target path. Read it and
* keep in RAM to facilitate quick follow symlink operation.
* We use f->dents field to store the target path, which
* is somewhat ugly. */
f->dents = kmalloc(je32_to_cpu(latest_node->csize) + 1, GFP_KERNEL);
if (!f->dents) {
printk(KERN_WARNING "Can't allocate %d bytes of memory "
"for the symlink target path cache\n",
je32_to_cpu(latest_node->csize));
up(&f->sem);
jffs2_do_clear_inode(c, f);
return -ENOMEM;
}
ret = jffs2_flash_read(c, ref_offset(fn->raw) + sizeof(*latest_node),
je32_to_cpu(latest_node->csize), &retlen, (char *)f->dents);
if (ret || retlen != je32_to_cpu(latest_node->csize)) {
if (retlen != je32_to_cpu(latest_node->csize))
ret = -EIO;
kfree(f->dents);
f->dents = NULL;
up(&f->sem);
jffs2_do_clear_inode(c, f);
return -ret;
}
((char *)f->dents)[je32_to_cpu(latest_node->csize)] = '\0';
D1(printk(KERN_DEBUG "jffs2_do_read_inode(): symlink's target '%s' cached\n",
(char *)f->dents));
}
/* fall through... */
case S_IFBLK:
@@ -683,12 +717,20 @@ void jffs2_do_clear_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f)
jffs2_kill_fragtree(&f->fragtree, deleted?c:NULL);
fds = f->dents;
/* For symlink inodes we us f->dents to store the target path name */
if (S_ISLNK(OFNI_EDONI_2SFFJ(f)->i_mode)) {
if (f->dents) {
kfree(f->dents);
f->dents = NULL;
}
} else {
fds = f->dents;
while(fds) {
fd = fds;
fds = fd->next;
jffs2_free_full_dirent(fd);
while(fds) {
fd = fds;
fds = fd->next;
jffs2_free_full_dirent(fd);
}
}
if (f->inocache && f->inocache->state != INO_STATE_CHECKING) {