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hpfs: remove the BKL

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This removes the BKL in hpfs in a rather awful
way, by making the code only work on uniprocessor
systems without kernel preemption, as suggested
by Andi Kleen.

The HPFS code probably has close to zero remaining
users on current kernels, all archeological uses of
the file system can probably be done with the significant
restrictions.

The hpfs_lock/hpfs_unlock functions are left in the
code, sincen Mikulas has indicated that he is still
interested in fixing it in a better way.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Andi Kleen <ak@linux.intel.com>
Cc: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Cc: linux-fsdevel@vger.kernel.org
This commit is contained in:
Arnd Bergmann
2011-01-22 20:26:12 +01:00
parent 5edc341313
commit 9a311b96c3
7 changed files with 75 additions and 62 deletions
Download Patch File Download Diff File Expand all files Collapse all files

49
fs/hpfs/namei.c
View File

@@ -6,7 +6,6 @@
* adding & removing files & directories
*/
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include "hpfs_fn.h"
static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
@@ -25,7 +24,7 @@ static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
struct hpfs_dirent dee;
int err;
if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
lock_kernel();
hpfs_lock(dir->i_sb);
err = -ENOSPC;
fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
if (!fnode)
@@ -103,7 +102,7 @@ static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
}
d_instantiate(dentry, result);
mutex_unlock(&hpfs_i(dir)->i_mutex);
unlock_kernel();
hpfs_unlock(dir->i_sb);
return 0;
bail3:
mutex_unlock(&hpfs_i(dir)->i_mutex);
@@ -115,7 +114,7 @@ bail1:
brelse(bh);
hpfs_free_sectors(dir->i_sb, fno, 1);
bail:
unlock_kernel();
hpfs_unlock(dir->i_sb);
return err;
}
@@ -132,7 +131,7 @@ static int hpfs_create(struct inode *dir, struct dentry *dentry, int mode, struc
int err;
if ((err = hpfs_chk_name(name, &len)))
return err==-ENOENT ? -EINVAL : err;
lock_kernel();
hpfs_lock(dir->i_sb);
err = -ENOSPC;
fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
if (!fnode)
@@ -195,7 +194,7 @@ static int hpfs_create(struct inode *dir, struct dentry *dentry, int mode, struc
}
d_instantiate(dentry, result);
mutex_unlock(&hpfs_i(dir)->i_mutex);
unlock_kernel();
hpfs_unlock(dir->i_sb);
return 0;
bail2:
@@ -205,7 +204,7 @@ bail1:
brelse(bh);
hpfs_free_sectors(dir->i_sb, fno, 1);
bail:
unlock_kernel();
hpfs_unlock(dir->i_sb);
return err;
}
@@ -224,7 +223,7 @@ static int hpfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t
if (hpfs_sb(dir->i_sb)->sb_eas < 2) return -EPERM;
if (!new_valid_dev(rdev))
return -EINVAL;
lock_kernel();
hpfs_lock(dir->i_sb);
err = -ENOSPC;
fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh);
if (!fnode)
@@ -274,7 +273,7 @@ static int hpfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t
d_instantiate(dentry, result);
mutex_unlock(&hpfs_i(dir)->i_mutex);
brelse(bh);
unlock_kernel();
hpfs_unlock(dir->i_sb);
return 0;
bail2:
mutex_unlock(&hpfs_i(dir)->i_mutex);
@@ -283,7 +282,7 @@ bail1:
brelse(bh);
hpfs_free_sectors(dir->i_sb, fno, 1);
bail:
unlock_kernel();
hpfs_unlock(dir->i_sb);
return err;
}
@@ -299,9 +298,9 @@ static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *sy
struct inode *result;
int err;
if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err;
lock_kernel();
hpfs_lock(dir->i_sb);
if (hpfs_sb(dir->i_sb)->sb_eas < 2) {
unlock_kernel();
hpfs_unlock(dir->i_sb);
return -EPERM;
}
err = -ENOSPC;
@@ -354,7 +353,7 @@ static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *sy
hpfs_write_inode_nolock(result);
d_instantiate(dentry, result);
mutex_unlock(&hpfs_i(dir)->i_mutex);
unlock_kernel();
hpfs_unlock(dir->i_sb);
return 0;
bail2:
mutex_unlock(&hpfs_i(dir)->i_mutex);
@@ -363,7 +362,7 @@ bail1:
brelse(bh);
hpfs_free_sectors(dir->i_sb, fno, 1);
bail:
unlock_kernel();
hpfs_unlock(dir->i_sb);
return err;
}
@@ -380,7 +379,7 @@ static int hpfs_unlink(struct inode *dir, struct dentry *dentry)
int rep = 0;
int err;
lock_kernel();
hpfs_lock(dir->i_sb);
hpfs_adjust_length(name, &len);
again:
mutex_lock(&hpfs_i(inode)->i_parent_mutex);
@@ -416,7 +415,7 @@ again:
dentry_unhash(dentry);
if (!d_unhashed(dentry)) {
dput(dentry);
unlock_kernel();
hpfs_unlock(dir->i_sb);
return -ENOSPC;
}
if (generic_permission(inode, MAY_WRITE, 0, NULL) ||
@@ -435,7 +434,7 @@ again:
if (!err)
goto again;
}
unlock_kernel();
hpfs_unlock(dir->i_sb);
return -ENOSPC;
default:
drop_nlink(inode);
@@ -448,7 +447,7 @@ out1:
out:
mutex_unlock(&hpfs_i(dir)->i_mutex);
mutex_unlock(&hpfs_i(inode)->i_parent_mutex);
unlock_kernel();
hpfs_unlock(dir->i_sb);
return err;
}
@@ -466,7 +465,7 @@ static int hpfs_rmdir(struct inode *dir, struct dentry *dentry)
int r;
hpfs_adjust_length(name, &len);
lock_kernel();
hpfs_lock(dir->i_sb);
mutex_lock(&hpfs_i(inode)->i_parent_mutex);
mutex_lock(&hpfs_i(dir)->i_mutex);
err = -ENOENT;
@@ -508,7 +507,7 @@ out1:
out:
mutex_unlock(&hpfs_i(dir)->i_mutex);
mutex_unlock(&hpfs_i(inode)->i_parent_mutex);
unlock_kernel();
hpfs_unlock(dir->i_sb);
return err;
}
@@ -521,21 +520,21 @@ static int hpfs_symlink_readpage(struct file *file, struct page *page)
int err;
err = -EIO;
lock_kernel();
hpfs_lock(i->i_sb);
if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh)))
goto fail;
err = hpfs_read_ea(i->i_sb, fnode, "SYMLINK", link, PAGE_SIZE);
brelse(bh);
if (err)
goto fail;
unlock_kernel();
hpfs_unlock(i->i_sb);
SetPageUptodate(page);
kunmap(page);
unlock_page(page);
return 0;
fail:
unlock_kernel();
hpfs_unlock(i->i_sb);
SetPageError(page);
kunmap(page);
unlock_page(page);
@@ -567,7 +566,7 @@ static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry,
err = 0;
hpfs_adjust_length(old_name, &old_len);
lock_kernel();
hpfs_lock(i->i_sb);
/* order doesn't matter, due to VFS exclusion */
mutex_lock(&hpfs_i(i)->i_parent_mutex);
if (new_inode)
@@ -659,7 +658,7 @@ end1:
mutex_unlock(&hpfs_i(i)->i_parent_mutex);
if (new_inode)
mutex_unlock(&hpfs_i(new_inode)->i_parent_mutex);
unlock_kernel();
hpfs_unlock(i->i_sb);
return err;
}