lkml.org 
[lkml]   [2011]   [Sep]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 7/7] LSEEK: BTRFS: Avoid i_mutex for SEEK_{CUR,SET,END}
Date
From: Andi Kleen <ak@linux.intel.com>

Don't need the i_mutex for those cases, only for SEEK_HOLE/DATA.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
fs/btrfs/file.c | 18 ++++++------------
1 files changed, 6 insertions(+), 12 deletions(-)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 62f56d4..ae7f37e 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1809,18 +1809,13 @@ static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int origin)
struct inode *inode = file->f_mapping->host;
int ret;

+ if (origin != SEEK_DATA && origin != SEEK_HOLE)
+ return generic_file_llseek(file, offset, origin);
+
mutex_lock(&inode->i_mutex);
- switch (origin) {
- case SEEK_END:
- case SEEK_CUR:
- offset = generic_file_llseek(file, offset, origin);
- goto out;
- case SEEK_DATA:
- case SEEK_HOLE:
- ret = find_desired_extent(inode, &offset, origin);
- if (ret)
- goto error;
- }
+ ret = find_desired_extent(inode, &offset, origin);
+ if (ret)
+ goto error;

if (offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET)) {
ret = -EINVAL;
@@ -1836,7 +1831,6 @@ static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int origin)
file->f_pos = offset;
file->f_version = 0;
}
-out:
mutex_unlock(&inode->i_mutex);
return offset;
error:
--
1.7.4.4


\
 
 \ /
  Last update: 2011-09-16 01:11    [from the cache]
©2003-2011 Jasper Spaans