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vfs: remove dget() from dentry_unhash() 

This serves no useful purpose that I can discern.  All callers (rename,
rmdir) hold their own reference to the dentry.

A quick audit of all file systems showed no relevant checks on the value
of d_count in vfs_rmdir/vfs_rename_dir paths.

Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Sage Weil 2011-05-24 13:06:05 -07:00 committed by Al Viro
parent 48293699a0
commit 64252c75a2
3 changed files with 1 additions and 8 deletions
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3
fs/hpfs/namei.c
View File

@ -414,7 +414,6 @@ again:
mutex_unlock(&hpfs_i(inode)->i_parent_mutex);
dentry_unhash(dentry);
if (!d_unhashed(dentry)) {
dput(dentry);
hpfs_unlock(dir->i_sb);
return -ENOSPC;
}
@ -422,7 +421,6 @@ again:
!S_ISREG(inode->i_mode) ||
get_write_access(inode)) {
d_rehash(dentry);
dput(dentry);
} else {
struct iattr newattrs;
/*printk("HPFS: truncating file before delete.\n");*/
@ -430,7 +428,6 @@ again:
newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
err = notify_change(dentry, &newattrs);
put_write_access(inode);
dput(dentry);
if (!err)
goto again;
}

5
fs/namei.c
View File

@ -2545,10 +2545,9 @@ SYSCALL_DEFINE2(mkdir, const char __user *, pathname, int, mode)
*/
void dentry_unhash(struct dentry *dentry)
{
dget(dentry);
shrink_dcache_parent(dentry);
spin_lock(&dentry->d_lock);
if (dentry->d_count == 2)
if (dentry->d_count == 1)
__d_drop(dentry);
spin_unlock(&dentry->d_lock);
}
@ -2575,7 +2574,6 @@ int vfs_rmdir(struct inode *dir, struct dentry *dentry)
dentry->d_inode->i_flags |= S_DEAD;
dont_mount(dentry);
}
dput(dentry);
}
}
mutex_unlock(&dentry->d_inode->i_mutex);
@ -3002,7 +3000,6 @@ static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
mutex_unlock(&target->i_mutex);
if (d_unhashed(new_dentry))
d_rehash(new_dentry);
dput(new_dentry);
}
if (!error)
if (!(old_dir->i_sb->s_type->fs_flags & FS_RENAME_DOES_D_MOVE))

1
fs/reiserfs/xattr.c
View File

@ -105,7 +105,6 @@ static int xattr_rmdir(struct inode *dir, struct dentry *dentry)
mutex_unlock(&dentry->d_inode->i_mutex);
if (!error)
d_delete(dentry);
dput(dentry);
return error;
}