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| author | OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> | 2010-01-12 03:32:24 +0900 |
|---|---|---|
| committer | OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> | 2010-01-12 03:47:25 +0900 |
| commit | 8045e2985012bdb95d832dfbcceae1815880a6ed (patch) | |
| tree | 513a853a81eee10f86047b681bf52132592b36b9 /fs/fat | |
| parent | 3c8ad49b015eb115fbd6982f56d530f53cf57f84 (diff) | |
| download | linux-stable-8045e2985012bdb95d832dfbcceae1815880a6ed.tar.gz linux-stable-8045e2985012bdb95d832dfbcceae1815880a6ed.tar.bz2 linux-stable-8045e2985012bdb95d832dfbcceae1815880a6ed.zip | |
fat: Fix vfat_lookup()
After d_find_alias(), vfat_lookup() checks !(->d_flags & DCACHE_DISCONNECTED)
without IS_ROOT(). This means it hits non-anonymous but disconnected
dentry. (NOTE: d_splice_alias() doesn't clear DCACHE_DISCONNECTED)
But, vfat_lookup() has interest to alias if it was non-anonymous. So,
this adds vfat_d_anon_disconn() helper to check it correctly.
Another bug is refcnt leak. It needs dput() for uninterested alias.
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Diffstat (limited to 'fs/fat')
| -rw-r--r-- | fs/fat/namei_vfat.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c index f565f24019b5..411c192a05fa 100644 --- a/fs/fat/namei_vfat.c +++ b/fs/fat/namei_vfat.c @@ -701,6 +701,15 @@ static int vfat_find(struct inode *dir, struct qstr *qname, return fat_search_long(dir, qname->name, len, sinfo); } +/* + * (nfsd's) anonymous disconnected dentry? + * NOTE: !IS_ROOT() is not anonymous (I.e. d_splice_alias() did the job). + */ +static int vfat_d_anon_disconn(struct dentry *dentry) +{ + return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); +} + static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) { @@ -729,11 +738,11 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry, } alias = d_find_alias(inode); - if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) { + if (alias && !vfat_d_anon_disconn(alias)) { /* - * This inode has non DCACHE_DISCONNECTED dentry. This - * means, the user did ->lookup() by an another name - * (longname vs 8.3 alias of it) in past. + * This inode has non anonymous-DCACHE_DISCONNECTED + * dentry. This means, the user did ->lookup() by an + * another name (longname vs 8.3 alias of it) in past. * * Switch to new one for reason of locality if possible. */ @@ -743,7 +752,9 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry, iput(inode); unlock_super(sb); return alias; - } + } else + dput(alias); + out: unlock_super(sb); dentry->d_op = sb->s_root->d_op; |