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authorLinus Torvalds <torvalds@linux-foundation.org>2008-05-19 19:53:01 -0700
committerJonathan Corbet <corbet@lwn.net>2008-06-20 14:05:54 -0600
commit8f5934278d1d86590244c2791b28f77d67466007 (patch)
tree7db64d90ad2b1bd9d0c2e13b3b679a5a7d17f969 /fs/msdos
parent5ca6a93d802a9d110127556e5d3ed032fd273e03 (diff)
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Replace BKL with superblock lock in fat/msdos/vfat
This replaces the use of the BKL in the FAT family of filesystems with the existing superblock lock instead. The code already appears to do mostly proper locking with its own private spinlocks (and mutexes), but while the BKL could possibly have been dropped entirely, converting it to use the superblock lock (which is just a regular mutex) is the conservative thing to do. As a per-filesystem mutex, it not only won't have any of the possible latency issues related to the BKL, but the lock is obviously private to the particular filesystem instance and will thus not cause problems for entirely unrelated users like the BKL can. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'fs/msdos')
-rw-r--r--fs/msdos/namei.c35
1 files changed, 19 insertions, 16 deletions
diff --git a/fs/msdos/namei.c b/fs/msdos/namei.c
index 05ff4f1d702..1f7f2956412 100644
--- a/fs/msdos/namei.c
+++ b/fs/msdos/namei.c
@@ -214,7 +214,7 @@ static struct dentry *msdos_lookup(struct inode *dir, struct dentry *dentry,
dentry->d_op = &msdos_dentry_operations;
- lock_kernel();
+ lock_super(sb);
res = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
if (res == -ENOENT)
goto add;
@@ -232,7 +232,7 @@ add:
if (dentry)
dentry->d_op = &msdos_dentry_operations;
out:
- unlock_kernel();
+ unlock_super(sb);
if (!res)
return dentry;
return ERR_PTR(res);
@@ -286,7 +286,7 @@ static int msdos_create(struct inode *dir, struct dentry *dentry, int mode,
unsigned char msdos_name[MSDOS_NAME];
int err, is_hid;
- lock_kernel();
+ lock_super(sb);
err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
msdos_name, &MSDOS_SB(sb)->options);
@@ -315,7 +315,7 @@ static int msdos_create(struct inode *dir, struct dentry *dentry, int mode,
d_instantiate(dentry, inode);
out:
- unlock_kernel();
+ unlock_super(sb);
if (!err)
err = fat_flush_inodes(sb, dir, inode);
return err;
@@ -324,11 +324,12 @@ out:
/***** Remove a directory */
static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
{
+ struct super_block *sb = dir->i_sb;
struct inode *inode = dentry->d_inode;
struct fat_slot_info sinfo;
int err;
- lock_kernel();
+ lock_super(sb);
/*
* Check whether the directory is not in use, then check
* whether it is empty.
@@ -349,9 +350,9 @@ static int msdos_rmdir(struct inode *dir, struct dentry *dentry)
inode->i_ctime = CURRENT_TIME_SEC;
fat_detach(inode);
out:
- unlock_kernel();
+ unlock_super(sb);
if (!err)
- err = fat_flush_inodes(inode->i_sb, dir, inode);
+ err = fat_flush_inodes(sb, dir, inode);
return err;
}
@@ -366,7 +367,7 @@ static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode)
struct timespec ts;
int err, is_hid, cluster;
- lock_kernel();
+ lock_super(sb);
err = msdos_format_name(dentry->d_name.name, dentry->d_name.len,
msdos_name, &MSDOS_SB(sb)->options);
@@ -404,14 +405,14 @@ static int msdos_mkdir(struct inode *dir, struct dentry *dentry, int mode)
d_instantiate(dentry, inode);
- unlock_kernel();
+ unlock_super(sb);
fat_flush_inodes(sb, dir, inode);
return 0;
out_free:
fat_free_clusters(dir, cluster);
out:
- unlock_kernel();
+ unlock_super(sb);
return err;
}
@@ -419,10 +420,11 @@ out:
static int msdos_unlink(struct inode *dir, struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
+ struct super_block *sb= inode->i_sb;
struct fat_slot_info sinfo;
int err;
- lock_kernel();
+ lock_super(sb);
err = msdos_find(dir, dentry->d_name.name, dentry->d_name.len, &sinfo);
if (err)
goto out;
@@ -434,9 +436,9 @@ static int msdos_unlink(struct inode *dir, struct dentry *dentry)
inode->i_ctime = CURRENT_TIME_SEC;
fat_detach(inode);
out:
- unlock_kernel();
+ unlock_super(sb);
if (!err)
- err = fat_flush_inodes(inode->i_sb, dir, inode);
+ err = fat_flush_inodes(sb, dir, inode);
return err;
}
@@ -618,10 +620,11 @@ error_inode:
static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
+ struct super_block *sb = old_dir->i_sb;
unsigned char old_msdos_name[MSDOS_NAME], new_msdos_name[MSDOS_NAME];
int err, is_hid;
- lock_kernel();
+ lock_super(sb);
err = msdos_format_name(old_dentry->d_name.name,
old_dentry->d_name.len, old_msdos_name,
@@ -640,9 +643,9 @@ static int msdos_rename(struct inode *old_dir, struct dentry *old_dentry,
err = do_msdos_rename(old_dir, old_msdos_name, old_dentry,
new_dir, new_msdos_name, new_dentry, is_hid);
out:
- unlock_kernel();
+ unlock_super(sb);
if (!err)
- err = fat_flush_inodes(old_dir->i_sb, old_dir, new_dir);
+ err = fat_flush_inodes(sb, old_dir, new_dir);
return err;
}