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bfs: kill BKL

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Replace the BKL-based locking scheme used in the bfs driver by a private
filesystem-wide mutex.

Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@movial.fi>
Cc: Tigran Aivazian <tigran_aivazian@symantec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dmitri Vorobiev
2008-07-25 19:44:54 -07:00
committed by Linus Torvalds
parent 75b25b4cab
commit 3f165e4cf2
4 changed files with 44 additions and 31 deletions
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46
fs/bfs/dir.c
View File

@@ -32,16 +32,17 @@ static int bfs_readdir(struct file *f, void *dirent, filldir_t filldir)
struct inode *dir = f->f_path.dentry->d_inode;
struct buffer_head *bh;
struct bfs_dirent *de;
struct bfs_sb_info *info = BFS_SB(dir->i_sb);
unsigned int offset;
int block;
lock_kernel();
mutex_lock(&info->bfs_lock);
if (f->f_pos & (BFS_DIRENT_SIZE - 1)) {
printf("Bad f_pos=%08lx for %s:%08lx\n",
(unsigned long)f->f_pos,
dir->i_sb->s_id, dir->i_ino);
unlock_kernel();
mutex_unlock(&info->bfs_lock);
return -EBADF;
}
@@ -61,7 +62,7 @@ static int bfs_readdir(struct file *f, void *dirent, filldir_t filldir)
le16_to_cpu(de->ino),
DT_UNKNOWN) < 0) {
brelse(bh);
unlock_kernel();
mutex_unlock(&info->bfs_lock);
return 0;
}
}
@@ -71,7 +72,7 @@ static int bfs_readdir(struct file *f, void *dirent, filldir_t filldir)
brelse(bh);
}
unlock_kernel();
mutex_unlock(&info->bfs_lock);
return 0;
}
@@ -95,10 +96,10 @@ static int bfs_create(struct inode *dir, struct dentry *dentry, int mode,
inode = new_inode(s);
if (!inode)
return -ENOSPC;
lock_kernel();
mutex_lock(&info->bfs_lock);
ino = find_first_zero_bit(info->si_imap, info->si_lasti);
if (ino > info->si_lasti) {
unlock_kernel();
mutex_unlock(&info->bfs_lock);
iput(inode);
return -ENOSPC;
}
@@ -125,10 +126,10 @@ static int bfs_create(struct inode *dir, struct dentry *dentry, int mode,
if (err) {
inode_dec_link_count(inode);
iput(inode);
unlock_kernel();
mutex_unlock(&info->bfs_lock);
return err;
}
unlock_kernel();
mutex_unlock(&info->bfs_lock);
d_instantiate(dentry, inode);
return 0;
}
@@ -139,22 +140,23 @@ static struct dentry *bfs_lookup(struct inode *dir, struct dentry *dentry,
struct inode *inode = NULL;
struct buffer_head *bh;
struct bfs_dirent *de;
struct bfs_sb_info *info = BFS_SB(dir->i_sb);
if (dentry->d_name.len > BFS_NAMELEN)
return ERR_PTR(-ENAMETOOLONG);
lock_kernel();
mutex_lock(&info->bfs_lock);
bh = bfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
if (bh) {
unsigned long ino = (unsigned long)le16_to_cpu(de->ino);
brelse(bh);
inode = bfs_iget(dir->i_sb, ino);
if (IS_ERR(inode)) {
unlock_kernel();
mutex_unlock(&info->bfs_lock);
return ERR_CAST(inode);
}
}
unlock_kernel();
mutex_unlock(&info->bfs_lock);
d_add(dentry, inode);
return NULL;
}
@@ -163,13 +165,14 @@ static int bfs_link(struct dentry *old, struct inode *dir,
struct dentry *new)
{
struct inode *inode = old->d_inode;
struct bfs_sb_info *info = BFS_SB(inode->i_sb);
int err;
lock_kernel();
mutex_lock(&info->bfs_lock);
err = bfs_add_entry(dir, new->d_name.name, new->d_name.len,
inode->i_ino);
if (err) {
unlock_kernel();
mutex_unlock(&info->bfs_lock);
return err;
}
inc_nlink(inode);
@@ -177,19 +180,19 @@ static int bfs_link(struct dentry *old, struct inode *dir,
mark_inode_dirty(inode);
atomic_inc(&inode->i_count);
d_instantiate(new, inode);
unlock_kernel();
mutex_unlock(&info->bfs_lock);
return 0;
}
static int bfs_unlink(struct inode *dir, struct dentry *dentry)
{
int error = -ENOENT;
struct inode *inode;
struct inode *inode = dentry->d_inode;
struct buffer_head *bh;
struct bfs_dirent *de;
struct bfs_sb_info *info = BFS_SB(inode->i_sb);
inode = dentry->d_inode;
lock_kernel();
mutex_lock(&info->bfs_lock);
bh = bfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
if (!bh || (le16_to_cpu(de->ino) != inode->i_ino))
goto out_brelse;
@@ -210,7 +213,7 @@ static int bfs_unlink(struct inode *dir, struct dentry *dentry)
out_brelse:
brelse(bh);
unlock_kernel();
mutex_unlock(&info->bfs_lock);
return error;
}
@@ -220,6 +223,7 @@ static int bfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *old_inode, *new_inode;
struct buffer_head *old_bh, *new_bh;
struct bfs_dirent *old_de, *new_de;
struct bfs_sb_info *info;
int error = -ENOENT;
old_bh = new_bh = NULL;
@@ -227,7 +231,9 @@ static int bfs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (S_ISDIR(old_inode->i_mode))
return -EINVAL;
lock_kernel();
info = BFS_SB(old_inode->i_sb);
mutex_lock(&info->bfs_lock);
old_bh = bfs_find_entry(old_dir,
old_dentry->d_name.name,
old_dentry->d_name.len, &old_de);
@@ -264,7 +270,7 @@ static int bfs_rename(struct inode *old_dir, struct dentry *old_dentry,
error = 0;
end_rename:
unlock_kernel();
mutex_unlock(&info->bfs_lock);
brelse(old_bh);
brelse(new_bh);
return error;