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split __follow_mount_rcu() into normal and .. cases

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2011-05-27 06:50:06 -04:00
parent dc7acbb251
commit 287548e46a
1 changed files with 26 additions and 9 deletions
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35
fs/namei.c
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@ -919,12 +919,11 @@ static inline bool managed_dentry_might_block(struct dentry *dentry)
} }
/* /*
* Skip to top of mountpoint pile in rcuwalk mode. We abort the rcu-walk if we * Try to skip to top of mountpoint pile in rcuwalk mode. Fail if
* meet a managed dentry and we're not walking to "..". True is returned to * we meet a managed dentry that would need blocking.
* continue, false to abort.
*/ */
static bool __follow_mount_rcu(struct nameidata *nd, struct path *path, static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
struct inode **inode, bool reverse_transit) struct inode **inode)
{ {
for (;;) { for (;;) {
struct vfsmount *mounted; struct vfsmount *mounted;
@ -933,8 +932,7 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
* that wants to block transit. * that wants to block transit.
*/ */
*inode = path->dentry->d_inode; *inode = path->dentry->d_inode;
if (!reverse_transit && if (unlikely(managed_dentry_might_block(path->dentry)))
unlikely(managed_dentry_might_block(path->dentry)))
return false; return false;
if (!d_mountpoint(path->dentry)) if (!d_mountpoint(path->dentry))
@ -949,10 +947,29 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
} }
if (unlikely(path->dentry->d_flags & DCACHE_NEED_AUTOMOUNT)) if (unlikely(path->dentry->d_flags & DCACHE_NEED_AUTOMOUNT))
return reverse_transit; return false;
return true; return true;
} }
static void follow_mount_rcu(struct nameidata *nd, struct path *path,
struct inode **inode)
{
for (;;) {
struct vfsmount *mounted;
*inode = path->dentry->d_inode;
if (!d_mountpoint(path->dentry))
break;
mounted = __lookup_mnt(path->mnt, path->dentry, 1);
if (!mounted)
break;
path->mnt = mounted;
path->dentry = mounted->mnt_root;
nd->seq = read_seqcount_begin(&path->dentry->d_seq);
}
}
static int follow_dotdot_rcu(struct nameidata *nd) static int follow_dotdot_rcu(struct nameidata *nd)
{ {
struct inode *inode = nd->inode; struct inode *inode = nd->inode;
@ -982,7 +999,7 @@ static int follow_dotdot_rcu(struct nameidata *nd)
nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq); nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
inode = nd->path.dentry->d_inode; inode = nd->path.dentry->d_inode;
} }
__follow_mount_rcu(nd, &nd->path, &inode, true); follow_mount_rcu(nd, &nd->path, &inode);
nd->inode = inode; nd->inode = inode;
return 0; return 0;
@ -1157,7 +1174,7 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
} }
path->mnt = mnt; path->mnt = mnt;
path->dentry = dentry; path->dentry = dentry;
if (likely(__follow_mount_rcu(nd, path, inode, false))) if (likely(__follow_mount_rcu(nd, path, inode)))
return 0; return 0;
unlazy: unlazy:
if (unlazy_walk(nd, dentry)) if (unlazy_walk(nd, dentry))