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new helper: inode_unhashed()

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note: for race-free uses you inode_lock held

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2010-10-23 15:19:20 -04:00
commit 1d3382cbf0
6 changed files with 13 additions and 8 deletions
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4
mm/shmem.c
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@ -2146,7 +2146,7 @@ static int shmem_encode_fh(struct dentry *dentry, __u32 *fh, int *len,
if (*len < 3)
return 255;
if (hlist_unhashed(&inode->i_hash)) {
if (inode_unhashed(inode)) {
/* Unfortunately insert_inode_hash is not idempotent,
* so as we hash inodes here rather than at creation
* time, we need a lock to ensure we only try
@ -2154,7 +2154,7 @@ static int shmem_encode_fh(struct dentry *dentry, __u32 *fh, int *len,
*/
static DEFINE_SPINLOCK(lock);
spin_lock(&lock);
if (hlist_unhashed(&inode->i_hash))
if (inode_unhashed(inode))
__insert_inode_hash(inode,
inode->i_ino + inode->i_generation);
spin_unlock(&lock);