Messages in this thread Patch in this message | | | From | NeilBrown <> | Date | Wed, 02 Aug 2017 13:06:18 +1000 | Subject | [PATCH 4/6] staging: lluste: llite: simplify ll_find_alias() |
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Now that ll_find_alias is only searching for one type of dentry, we can return as soon as we find it. This allows substantial simplification, and brings the bonus that we don't need to take the d_lock again just to increment the ref-count. We can increment it immediately that the dentry is found.
Signed-off-by: NeilBrown <neilb@suse.com> --- drivers/staging/lustre/lustre/llite/namei.c | 23 ++++++++--------------- 1 file changed, 8 insertions(+), 15 deletions(-)
diff --git a/drivers/staging/lustre/lustre/llite/namei.c b/drivers/staging/lustre/lustre/llite/namei.c index 329038a10a07..51838eed501a 100644 --- a/drivers/staging/lustre/lustre/llite/namei.c +++ b/drivers/staging/lustre/lustre/llite/namei.c @@ -382,13 +382,11 @@ void ll_i2gids(__u32 *suppgids, struct inode *i1, struct inode *i2) */ static struct dentry *ll_find_alias(struct inode *inode, struct dentry *dentry) { - struct dentry *alias, *invalid_alias; + struct dentry *alias; if (hlist_empty(&inode->i_dentry)) return NULL; - invalid_alias = NULL; - spin_lock(&inode->i_lock); hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) { LASSERT(alias != dentry); @@ -398,22 +396,17 @@ static struct dentry *ll_find_alias(struct inode *inode, struct dentry *dentry) alias->d_name.hash == dentry->d_name.hash && alias->d_name.len == dentry->d_name.len && memcmp(alias->d_name.name, dentry->d_name.name, - dentry->d_name.len) == 0) - invalid_alias = alias; - spin_unlock(&alias->d_lock); - - if (invalid_alias) - break; - } - alias = invalid_alias ?: NULL; - if (alias) { - spin_lock(&alias->d_lock); - dget_dlock(alias); + dentry->d_name.len) == 0) { + dget_dlock(alias); + spin_unlock(&alias->d_lock); + spin_unlock(&inode->i_lock); + return alias; + } spin_unlock(&alias->d_lock); } spin_unlock(&inode->i_lock); - return alias; + return NULL; } /*
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