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authorArtem B. Bityuckiy <dedekind@infradead.org>2005-03-01 10:50:52 +0000
committerThomas Gleixner <tglx@mtd.linutronix.de>2005-05-23 12:48:15 +0200
commit32f1a95d505b99b1f01b6aeea36ec3f97245b357 (patch)
tree5da0e8b01362cf6b0cc79f11e5e9b3fd4ad169d6 /fs/jffs2/readinode.c
parent20a6c211903dce92a0db7f19c221cfa3f2cb4c32 (diff)
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[JFFS2] Add symlink caching support.
Signed-off-by: Artem B. Bityuckiy <dedekind@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'fs/jffs2/readinode.c')
-rw-r--r--fs/jffs2/readinode.c54
1 files changed, 48 insertions, 6 deletions
diff --git a/fs/jffs2/readinode.c b/fs/jffs2/readinode.c
index a1980a9da531..ef552477c813 100644
--- a/fs/jffs2/readinode.c
+++ b/fs/jffs2/readinode.c
@@ -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) {