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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6 

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
  cifs: guard against hardlinking directories
This commit is contained in:
Linus Torvalds 2010-05-13 10:36:16 -07:00
parent 002baeecf5 3d69438031
commit 4462dc0284
2 changed files with 20 additions and 2 deletions
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1
fs/cifs/cifsglob.h
View File

@ -502,6 +502,7 @@ struct dfs_info3_param {
#define CIFS_FATTR_DFS_REFERRAL 0x1
#define CIFS_FATTR_DELETE_PENDING 0x2
#define CIFS_FATTR_NEED_REVAL 0x4
#define CIFS_FATTR_INO_COLLISION 0x8
struct cifs_fattr {
u32 cf_flags;

21
fs/cifs/inode.c
View File

@ -715,6 +715,16 @@ cifs_find_inode(struct inode *inode, void *opaque)
if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
return 0;
/*
* uh oh -- it's a directory. We can't use it since hardlinked dirs are
* verboten. Disable serverino and return it as if it were found, the
* caller can discard it, generate a uniqueid and retry the find
*/
if (S_ISDIR(inode->i_mode) && !list_empty(&inode->i_dentry)) {
fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
cifs_autodisable_serverino(CIFS_SB(inode->i_sb));
}
return 1;
}
@ -734,15 +744,22 @@ cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
unsigned long hash;
struct inode *inode;
retry_iget5_locked:
cFYI(1, ("looking for uniqueid=%llu", fattr->cf_uniqueid));
/* hash down to 32-bits on 32-bit arch */
hash = cifs_uniqueid_to_ino_t(fattr->cf_uniqueid);
inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
/* we have fattrs in hand, update the inode */
if (inode) {
/* was there a problematic inode number collision? */
if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
iput(inode);
fattr->cf_uniqueid = iunique(sb, ROOT_I);
fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
goto retry_iget5_locked;
}
cifs_fattr_to_inode(inode, fattr);
if (sb->s_flags & MS_NOATIME)
inode->i_flags |= S_NOATIME | S_NOCMTIME;