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authorArnd Bergmann <arnd@arndb.de>2010-07-07 22:55:17 +0200
committerArnd Bergmann <arnd@arndb.de>2010-10-15 15:53:34 +0200
commitab91261f5c43f196ec7ff1d113847b87b7606b26 (patch)
treeba368bdd2156e3e6671be4bc1c0933fa5fad51b9 /fs/read_write.c
parent6038f373a3dc1f1c26496e60b6c40b164716f07e (diff)
downloadop-kernel-dev-ab91261f5c43f196ec7ff1d113847b87b7606b26.zip
op-kernel-dev-ab91261f5c43f196ec7ff1d113847b87b7606b26.tar.gz
vfs: don't use BKL in default_llseek
There are currently 191 users of default_llseek. Nine of these are in device drivers that use the big kernel lock. None of these ever touch file->f_pos outside of llseek or file_pos_write. Consequently, we never rely on the BKL in the default_llseek function and can replace that with i_mutex, which is also used in generic_file_llseek. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index 74e3658..fd09f61 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -124,7 +124,7 @@ loff_t default_llseek(struct file *file, loff_t offset, int origin)
{
loff_t retval;
- lock_kernel();
+ mutex_lock(&file->f_dentry->d_inode->i_mutex);
switch (origin) {
case SEEK_END:
offset += i_size_read(file->f_path.dentry->d_inode);
@@ -145,7 +145,7 @@ loff_t default_llseek(struct file *file, loff_t offset, int origin)
retval = offset;
}
out:
- unlock_kernel();
+ mutex_unlock(&file->f_dentry->d_inode->i_mutex);
return retval;
}
EXPORT_SYMBOL(default_llseek);
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