From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
The root directory inode is added to the directory hash table in
fat_attach when mounted with nfs option. Since root dentry never
expires until umount, fat_dget never fails to return the root inode
for subdirectories of root inode.i.e., parent_logstart cannot be zero.
Signed-off-by: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
Signed-off-by: Ravishankar N <ravi.n1@xxxxxxxxxxx>
Signed-off-by: Amit Sahrawat <a.sahrawat@xxxxxxxxxxx>
---
fs/fat/nfs.c | 51 ++++++++++++++++++++++-----------------------------
1 file changed, 22 insertions(+), 29 deletions(-)
diff --git a/fs/fat/nfs.c b/fs/fat/nfs.c
index a4e6ac7..671a75d 100644
--- a/fs/fat/nfs.c
+++ b/fs/fat/nfs.c
@@ -274,36 +274,29 @@ struct dentry *fat_get_parent(struct dentry *child_dir)
parent_inode = fat_dget(sb, parent_logstart);
if (parent_inode || sbi->options.nfs != FAT_NFS_NOSTALE_RO)
goto out;
- if (!parent_logstart)
- /*logstart of dotdot entry is zero if
- * if the directory's parent is root
- */
- parent_inode = sb->s_root->d_inode;
- else {
- blknr = fat_clus_to_blknr(sbi, parent_logstart);
- parent_bh = sb_bread(sb, blknr);
- if (!parent_bh) {
- fat_msg(sb, KERN_ERR,
- "NFS:unable to read cluster of parent directory");
- goto out;
- }
- de = (struct msdos_dir_entry *) parent_bh->b_data;
- clus_to_match = fat_get_start(sbi, &de[0]);
- search_clus = fat_get_start(sbi, &de[1]);
- if (!search_clus)
- search_clus = sbi->root_cluster;
- brelse(parent_bh);
- do {
- parent_inode = fat_traverse_cluster(sb,
- search_clus, clus_to_match);
- if (IS_ERR(parent_inode) || parent_inode)
- break;
- search_clus = fat_read_next_clus(sb,
- search_clus);
- if (search_clus < 0)
- break;
- } while (search_clus != FAT_ENT_EOF);
+ blknr = fat_clus_to_blknr(sbi, parent_logstart);
+ parent_bh = sb_bread(sb, blknr);
+ if (!parent_bh) {
+ fat_msg(sb, KERN_ERR,
+ "NFS:unable to read cluster of parent directory");
+ goto out;
}
+ de = (struct msdos_dir_entry *) parent_bh->b_data;
+ clus_to_match = fat_get_start(sbi, &de[0]);
+ search_clus = fat_get_start(sbi, &de[1]);
+ if (!search_clus)
+ search_clus = sbi->root_cluster;
+ brelse(parent_bh);
+ do {
+ parent_inode = fat_traverse_cluster(sb,
+ search_clus, clus_to_match);
+ if (IS_ERR(parent_inode) || parent_inode)
+ break;
+ search_clus = fat_read_next_clus(sb,
+ search_clus);
+ if (search_clus < 0)
+ break;
+ } while (search_clus != FAT_ENT_EOF);
}
out:
brelse(dotdot_bh);
--
1.7.9.5
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