[JFFS2] Add symlink caching support.

Signed-off-by: Artem B. Bityuckiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 21 insertions, 7 deletions

diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index 757306fa3ff4..6421be874ce3 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -7,7 +7,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: dir.c,v 1.84 2004/11/16 20:36:11 dwmw2 Exp $
+ * $Id: dir.c,v 1.85 2005/03/01 10:34:03 dedekind Exp $
  *
  */
 
@@ -296,11 +296,11 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
         struct jffs2_full_dirent *fd;
         int namelen;
         uint32_t alloclen, phys_ofs;
-        int ret;
+        int ret, targetlen = strlen(target);
 
         /* FIXME: If you care. We'd need to use frags for the target
            if it grows much more than this */
-        if (strlen(target) > 254)
+        if (targetlen > 254)
                 return -EINVAL;
 
         ri = jffs2_alloc_raw_inode();
@@ -314,7 +314,7 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
          * Just the node will do for now, though 
          */
         namelen = dentry->d_name.len;
-        ret = jffs2_reserve_space(c, sizeof(*ri) + strlen(target), &phys_ofs, &alloclen, ALLOC_NORMAL);
+        ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 
         if (ret) {
                 jffs2_free_raw_inode(ri);
@@ -333,16 +333,16 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
 
         f = JFFS2_INODE_INFO(inode);
 
-        inode->i_size = strlen(target);
+        inode->i_size = targetlen;
         ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
         ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 
         ri->compr = JFFS2_COMPR_NONE;
-        ri->data_crc = cpu_to_je32(crc32(0, target, strlen(target)));
+        ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
         
-        fn = jffs2_write_dnode(c, f, ri, target, strlen(target), phys_ofs, ALLOC_NORMAL);
+        fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL);
 
         jffs2_free_raw_inode(ri);
 
@@ -353,6 +353,20 @@ static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char
                 jffs2_clear_inode(inode);
                 return PTR_ERR(fn);
         }
+
+        /* We use f->dents field to store the target path. */
+        f->dents = kmalloc(targetlen + 1, GFP_KERNEL);
+        if (!f->dents) {
+                printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
+                up(&f->sem);
+                jffs2_complete_reservation(c);
+                jffs2_clear_inode(inode);
+                return -ENOMEM;
+        }
+
+        memcpy(f->dents, target, targetlen + 1);
+        D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->dents));
+
         /* No data here. Only a metadata node, which will be 
            obsoleted by the first data write
         */