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| author | Christoph Hellwig <hch@infradead.org> | 2007-07-17 04:04:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-17 10:23:06 -0700 |
| commit | dd90b50906db2c03e236e046f2fc7f7290efe4b4 (patch) | |
| tree | d507defbc526fb9ca1fae7c0c72d8add03396dcd | |
| parent | fb66a1989c8abc3015aa334f617658b277e5fe98 (diff) | |
| download | linux-dd90b50906db2c03e236e046f2fc7f7290efe4b4.tar.gz linux-dd90b50906db2c03e236e046f2fc7f7290efe4b4.tar.bz2 linux-dd90b50906db2c03e236e046f2fc7f7290efe4b4.zip | |
knfsd: exportfs: add find_disconnected_root helper
Break the loop that finds the root of a disconnected subtree into a helper of
its own to make reading easier and document the intent.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/exportfs/expfs.c | 39 |
1 files changed, 23 insertions, 16 deletions
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c index 085d6c547f44..166d8ca9eaea 100644 --- a/fs/exportfs/expfs.c +++ b/fs/exportfs/expfs.c @@ -70,6 +70,27 @@ find_acceptable_alias(struct dentry *result, return NULL; } +/* + * Find root of a disconnected subtree and return a reference to it. + */ +static struct dentry * +find_disconnected_root(struct dentry *dentry) +{ + dget(dentry); + spin_lock(&dentry->d_lock); + while (!IS_ROOT(dentry) && + (dentry->d_parent->d_flags & DCACHE_DISCONNECTED)) { + struct dentry *parent = dentry->d_parent; + dget(parent); + spin_unlock(&dentry->d_lock); + dput(dentry); + dentry = parent; + spin_lock(&dentry->d_lock); + } + spin_unlock(&dentry->d_lock); + return dentry; +} + /** * find_exported_dentry - helper routine to implement export_operations->decode_fh * @sb: The &super_block identifying the filesystem @@ -164,23 +185,9 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent, * the noprogress counter. If we go through the loop 10 times (2 is * probably enough) without getting anywhere, we just give up */ - noprogress= 0; + noprogress = 0; while (target_dir->d_flags & DCACHE_DISCONNECTED && noprogress++ < 10) { - struct dentry *pd = target_dir; - - dget(pd); - spin_lock(&pd->d_lock); - while (!IS_ROOT(pd) && - (pd->d_parent->d_flags&DCACHE_DISCONNECTED)) { - struct dentry *parent = pd->d_parent; - - dget(parent); - spin_unlock(&pd->d_lock); - dput(pd); - pd = parent; - spin_lock(&pd->d_lock); - } - spin_unlock(&pd->d_lock); + struct dentry *pd = find_disconnected_root(target_dir); if (!IS_ROOT(pd)) { /* must have found a connected parent - great */ |