With the switch to using inode->i_mutex locking during lookups/creation in
the xattr root, the per-super xattr lock is no longer needed.
This patch removes it.
Signed-off-by: Jeff Mahoney <jeffm@xxxxxxxx>
--
fs/reiserfs/inode.c | 14 -------
fs/reiserfs/namei.c | 29 ----------------
fs/reiserfs/super.c | 4 --
fs/reiserfs/xattr.c | 34 +++---------------
fs/reiserfs/xattr_acl.c | 74 ++++++++++++++++++-----------------------
include/linux/reiserfs_fs.h | 3 -
include/linux/reiserfs_fs_sb.h | 1
include/linux/reiserfs_xattr.h | 18 ---------
8 files changed, 40 insertions(+), 137 deletions(-)
--- a/fs/reiserfs/inode.c 2007-06-11 14:49:35.000000000 -0400
+++ b/fs/reiserfs/inode.c 2007-06-11 14:50:07.000000000 -0400
@@ -1966,19 +1966,7 @@ int reiserfs_new_inode(struct reiserfs_t
out_inserted_sd:
inode->i_nlink = 0;
th->t_trans_id = 0; /* so the caller can't use this handle later */
-
- /* If we were inheriting an ACL, we need to release the lock so that
- * iput doesn't deadlock in reiserfs_delete_xattrs. The locking
- * code really needs to be reworked, but this will take care of it
- * for now. -jeffm */
-#ifdef CONFIG_REISERFS_FS_POSIX_ACL
- if (REISERFS_I(dir)->i_acl_default && !IS_ERR(REISERFS_I(dir)->i_acl_default)) {
- reiserfs_write_unlock_xattrs(dir->i_sb);
- iput(inode);
- reiserfs_write_lock_xattrs(dir->i_sb);
- } else
-#endif
- iput(inode);
+ iput(inode);
return err;
}
--- a/fs/reiserfs/namei.c 2007-06-11 14:49:35.000000000 -0400
+++ b/fs/reiserfs/namei.c 2007-06-11 14:50:06.000000000 -0400
@@ -617,9 +617,6 @@ static int reiserfs_create(struct inode
reiserfs_write_lock(dir->i_sb);
- if (locked)
- reiserfs_write_lock_xattrs(dir->i_sb);
-
retval = journal_begin(&th, dir->i_sb, jbegin_count);
if (retval) {
drop_new_inode(inode);
@@ -632,11 +629,6 @@ static int reiserfs_create(struct inode
if (retval)
goto out_failed;
- if (locked) {
- reiserfs_write_unlock_xattrs(dir->i_sb);
- locked = 0;
- }
-
inode->i_op = &reiserfs_file_inode_operations;
inode->i_fop = &reiserfs_file_operations;
inode->i_mapping->a_ops = &reiserfs_address_space_operations;
@@ -661,8 +653,6 @@ static int reiserfs_create(struct inode
retval = journal_end(&th, dir->i_sb, jbegin_count);
out_failed:
- if (locked)
- reiserfs_write_unlock_xattrs(dir->i_sb);
reiserfs_write_unlock(dir->i_sb);
return retval;
}
@@ -692,9 +682,6 @@ static int reiserfs_mknod(struct inode *
reiserfs_write_lock(dir->i_sb);
- if (locked)
- reiserfs_write_lock_xattrs(dir->i_sb);
-
retval = journal_begin(&th, dir->i_sb, jbegin_count);
if (retval) {
drop_new_inode(inode);
@@ -708,11 +695,6 @@ static int reiserfs_mknod(struct inode *
goto out_failed;
}
- if (locked) {
- reiserfs_write_unlock_xattrs(dir->i_sb);
- locked = 0;
- }
-
inode->i_op = &reiserfs_special_inode_operations;
init_special_inode(inode, inode->i_mode, rdev);
@@ -740,8 +722,6 @@ static int reiserfs_mknod(struct inode *
retval = journal_end(&th, dir->i_sb, jbegin_count);
out_failed:
- if (locked)
- reiserfs_write_unlock_xattrs(dir->i_sb);
reiserfs_write_unlock(dir->i_sb);
return retval;
}
@@ -771,8 +751,6 @@ static int reiserfs_mkdir(struct inode *
locked = reiserfs_cache_default_acl(dir);
reiserfs_write_lock(dir->i_sb);
- if (locked)
- reiserfs_write_lock_xattrs(dir->i_sb);
retval = journal_begin(&th, dir->i_sb, jbegin_count);
if (retval) {
@@ -794,11 +772,6 @@ static int reiserfs_mkdir(struct inode *
goto out_failed;
}
- if (locked) {
- reiserfs_write_unlock_xattrs(dir->i_sb);
- locked = 0;
- }
-
reiserfs_update_inode_transaction(inode);
reiserfs_update_inode_transaction(dir);
@@ -826,8 +799,6 @@ static int reiserfs_mkdir(struct inode *
d_instantiate(dentry, inode);
retval = journal_end(&th, dir->i_sb, jbegin_count);
out_failed:
- if (locked)
- reiserfs_write_unlock_xattrs(dir->i_sb);
reiserfs_write_unlock(dir->i_sb);
return retval;
}
--- a/fs/reiserfs/super.c 2007-06-11 14:49:35.000000000 -0400
+++ b/fs/reiserfs/super.c 2007-06-11 14:50:06.000000000 -0400
@@ -1574,10 +1574,6 @@ static int reiserfs_fill_super(struct su
REISERFS_SB(s)->s_alloc_options.preallocmin = 0;
/* Preallocate by 16 blocks (17-1) at once */
REISERFS_SB(s)->s_alloc_options.preallocsize = 17;
-#ifdef CONFIG_REISERFS_FS_XATTR
- /* Initialize the rwsem for xattr dir */
- init_rwsem(&REISERFS_SB(s)->xattr_dir_sem);
-#endif
/* setup default block allocator options */
reiserfs_init_alloc_options(s);
--- a/fs/reiserfs/xattr.c 2007-06-11 14:49:35.000000000 -0400
+++ b/fs/reiserfs/xattr.c 2007-06-11 14:50:07.000000000 -0400
@@ -27,6 +27,12 @@
* these are special cases for filesystem ACLs, they are interpreted by the
* kernel, in addition, they are negatively and positively cached and attached
* to the inode so that unnecessary lookups are avoided.
+ *
+ * Locking works like so:
+ * The xattr root (/.reiserfs_priv/xattrs) is protected by its i_mutex.
+ * The xattr dir (/.reiserfs_priv/xattrs/<oid>.<gen>) is protected by
+ * inode->xattr_sem.
+ * The xattrs themselves are likewise protected by the xattr_sem.
*/
#include <linux/reiserfs_fs.h>
@@ -677,9 +683,7 @@ int reiserfs_delete_xattrs(struct inode
!reiserfs_xattrs(inode->i_sb)) {
return 0;
}
- reiserfs_read_lock_xattrs(inode->i_sb);
dir = open_xa_dir(inode, XATTR_REPLACE);
- reiserfs_read_unlock_xattrs(inode->i_sb);
if (IS_ERR(dir)) {
err = PTR_ERR(dir);
goto out;
@@ -705,11 +709,9 @@ int reiserfs_delete_xattrs(struct inode
/* Leftovers besides . and .. -- that's not good. */
if (dir->d_inode->i_nlink <= 2) {
root = open_xa_root(inode->i_sb, XATTR_REPLACE);
- reiserfs_write_lock_xattrs(inode->i_sb);
mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_XATTR);
err = vfs_rmdir(root->d_inode, dir);
mutex_unlock(&root->d_inode->i_mutex);
- reiserfs_write_unlock_xattrs(inode->i_sb);
dput(root);
} else {
reiserfs_warning(inode->i_sb, "jdm-20004",
@@ -772,9 +774,7 @@ int reiserfs_chown_xattrs(struct inode *
!reiserfs_xattrs(inode->i_sb)) {
return 0;
}
- reiserfs_read_lock_xattrs(inode->i_sb);
dir = open_xa_dir(inode, XATTR_REPLACE);
- reiserfs_read_unlock_xattrs(inode->i_sb);
if (IS_ERR(dir)) {
if (PTR_ERR(dir) != -ENODATA)
err = PTR_ERR(dir);
@@ -819,7 +819,6 @@ int reiserfs_chown_xattrs(struct inode *
/*
* Inode operation getxattr()
- * Preliminary locking: we down dentry->d_inode->i_mutex
*/
ssize_t
reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
@@ -833,9 +832,7 @@ reiserfs_getxattr(struct dentry * dentry
return -EOPNOTSUPP;
reiserfs_read_lock_xattr_i(dentry->d_inode);
- reiserfs_read_lock_xattrs(dentry->d_sb);
err = xah->get(dentry->d_inode, name, buffer, size);
- reiserfs_read_unlock_xattrs(dentry->d_sb);
reiserfs_read_unlock_xattr_i(dentry->d_inode);
return err;
}
@@ -851,23 +848,13 @@ reiserfs_setxattr(struct dentry *dentry,
{
struct reiserfs_xattr_handler *xah = find_xattr_handler_prefix(name);
int err;
- int lock;
if (!xah || !reiserfs_xattrs(dentry->d_sb) ||
get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
return -EOPNOTSUPP;
reiserfs_write_lock_xattr_i(dentry->d_inode);
- lock = !has_xattr_dir(dentry->d_inode);
- if (lock)
- reiserfs_write_lock_xattrs(dentry->d_sb);
- else
- reiserfs_read_lock_xattrs(dentry->d_sb);
err = xah->set(dentry->d_inode, name, value, size, flags);
- if (lock)
- reiserfs_write_unlock_xattrs(dentry->d_sb);
- else
- reiserfs_read_unlock_xattrs(dentry->d_sb);
reiserfs_write_unlock_xattr_i(dentry->d_inode);
return err;
}
@@ -887,8 +874,6 @@ int reiserfs_removexattr(struct dentry *
return -EOPNOTSUPP;
reiserfs_write_lock_xattr_i(dentry->d_inode);
- reiserfs_read_lock_xattrs(dentry->d_sb);
-
/* Deletion pre-operation */
if (xah->del) {
err = xah->del(dentry->d_inode, name);
@@ -902,7 +887,6 @@ int reiserfs_removexattr(struct dentry *
mark_inode_dirty(dentry->d_inode);
out:
- reiserfs_read_unlock_xattrs(dentry->d_sb);
reiserfs_write_unlock_xattr_i(dentry->d_inode);
return err;
}
@@ -951,8 +935,6 @@ reiserfs_listxattr_filler(void *buf, con
/*
* Inode operation listxattr()
- *
- * Preliminary locking: we down dentry->d_inode->i_mutex
*/
ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
{
@@ -969,9 +951,7 @@ ssize_t reiserfs_listxattr(struct dentry
return -EOPNOTSUPP;
reiserfs_read_lock_xattr_i(dentry->d_inode);
- reiserfs_read_lock_xattrs(dentry->d_sb);
dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE);
- reiserfs_read_unlock_xattrs(dentry->d_sb);
if (IS_ERR(dir)) {
err = PTR_ERR(dir);
if (err == -ENODATA)
@@ -1211,11 +1191,9 @@ static int reiserfs_check_acl(struct ino
int error = -EAGAIN; /* do regular unix permission checks by default */
reiserfs_read_lock_xattr_i(inode);
- reiserfs_read_lock_xattrs(inode->i_sb);
acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
- reiserfs_read_unlock_xattrs(inode->i_sb);
reiserfs_read_unlock_xattr_i(inode);
if (acl) {
--- a/fs/reiserfs/xattr_acl.c 2007-06-11 14:49:05.000000000 -0400
+++ b/fs/reiserfs/xattr_acl.c 2007-06-11 14:50:07.000000000 -0400
@@ -172,6 +172,29 @@ static void *posix_acl_to_disk(const str
return ERR_PTR(-EINVAL);
}
+static inline void iset_acl(struct inode *inode, struct posix_acl **i_acl,
+ struct posix_acl *acl)
+{
+ spin_lock(&inode->i_lock);
+ if (*i_acl != ERR_PTR(-ENODATA))
+ posix_acl_release(*i_acl);
+ *i_acl = posix_acl_dup(acl);
+ spin_unlock(&inode->i_lock);
+}
+
+static inline struct posix_acl *iget_acl(struct inode *inode,
+ struct posix_acl **i_acl)
+{
+ struct posix_acl *acl = ERR_PTR(-ENODATA);
+
+ spin_lock(&inode->i_lock);
+ if (*i_acl != ERR_PTR(-ENODATA))
+ acl = posix_acl_dup(*i_acl);
+ spin_unlock(&inode->i_lock);
+
+ return acl;
+}
+
/*
* Inode operation get_posix_acl().
*
@@ -199,11 +222,11 @@ struct posix_acl *reiserfs_get_acl(struc
return ERR_PTR(-EINVAL);
}
- if (IS_ERR(*p_acl)) {
- if (PTR_ERR(*p_acl) == -ENODATA)
- return NULL;
- } else if (*p_acl != NULL)
- return posix_acl_dup(*p_acl);
+ acl = iget_acl(inode, p_acl);
+ if (acl && !IS_ERR(acl))
+ return acl;
+ else if (PTR_ERR(acl) == -ENODATA)
+ return NULL;
size = reiserfs_xattr_get(inode, name, NULL, 0);
if (size < 0) {
@@ -229,7 +252,7 @@ struct posix_acl *reiserfs_get_acl(struc
} else {
acl = posix_acl_from_disk(value, retval);
if (!IS_ERR(acl))
- *p_acl = posix_acl_dup(acl);
+ iset_acl(inode, p_acl, acl);
}
kfree(value);
@@ -300,16 +323,8 @@ reiserfs_set_acl(struct inode *inode, in
kfree(value);
- if (!error) {
- /* Release the old one */
- if (!IS_ERR(*p_acl) && *p_acl)
- posix_acl_release(*p_acl);
-
- if (acl == NULL)
- *p_acl = ERR_PTR(-ENODATA);
- else
- *p_acl = posix_acl_dup(acl);
- }
+ if (!error)
+ iset_acl(inode, p_acl, acl);
return error;
}
@@ -404,9 +419,7 @@ int reiserfs_cache_default_acl(struct in
if (reiserfs_posixacl(inode->i_sb) && !is_reiserfs_priv_object(inode)) {
struct posix_acl *acl;
reiserfs_read_lock_xattr_i(inode);
- reiserfs_read_lock_xattrs(inode->i_sb);
acl = reiserfs_get_acl(inode, ACL_TYPE_DEFAULT);
- reiserfs_read_unlock_xattrs(inode->i_sb);
reiserfs_read_unlock_xattr_i(inode);
ret = (acl && !IS_ERR(acl));
if (ret)
@@ -429,9 +442,7 @@ int reiserfs_acl_chmod(struct inode *ino
return 0;
}
- reiserfs_read_lock_xattrs(inode->i_sb);
acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
- reiserfs_read_unlock_xattrs(inode->i_sb);
if (!acl)
return 0;
if (IS_ERR(acl))
@@ -442,17 +453,8 @@ int reiserfs_acl_chmod(struct inode *ino
return -ENOMEM;
error = posix_acl_chmod_masq(clone, inode->i_mode);
if (!error) {
- int lock = !has_xattr_dir(inode);
reiserfs_write_lock_xattr_i(inode);
- if (lock)
- reiserfs_write_lock_xattrs(inode->i_sb);
- else
- reiserfs_read_lock_xattrs(inode->i_sb);
error = reiserfs_set_acl(inode, ACL_TYPE_ACCESS, clone);
- if (lock)
- reiserfs_write_unlock_xattrs(inode->i_sb);
- else
- reiserfs_read_unlock_xattrs(inode->i_sb);
reiserfs_write_unlock_xattr_i(inode);
}
posix_acl_release(clone);
@@ -480,14 +482,9 @@ posix_acl_access_set(struct inode *inode
static int posix_acl_access_del(struct inode *inode, const char *name)
{
struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
- struct posix_acl **acl = &reiserfs_i->i_acl_access;
if (strlen(name) != sizeof(POSIX_ACL_XATTR_ACCESS) - 1)
return -EINVAL;
- if (!IS_ERR(*acl) && *acl) {
- posix_acl_release(*acl);
- *acl = ERR_PTR(-ENODATA);
- }
-
+ iset_acl(inode, &reiserfs_i->i_acl_access, ERR_PTR(-ENODATA));
return 0;
}
@@ -533,14 +530,9 @@ posix_acl_default_set(struct inode *inod
static int posix_acl_default_del(struct inode *inode, const char *name)
{
struct reiserfs_inode_info *reiserfs_i = REISERFS_I(inode);
- struct posix_acl **acl = &reiserfs_i->i_acl_default;
if (strlen(name) != sizeof(POSIX_ACL_XATTR_DEFAULT) - 1)
return -EINVAL;
- if (!IS_ERR(*acl) && *acl) {
- posix_acl_release(*acl);
- *acl = ERR_PTR(-ENODATA);
- }
-
+ iset_acl(inode, &reiserfs_i->i_acl_default, ERR_PTR(-ENODATA));
return 0;
}
--- a/include/linux/reiserfs_fs.h 2007-06-11 14:49:35.000000000 -0400
+++ b/include/linux/reiserfs_fs.h 2007-06-11 14:50:06.000000000 -0400
@@ -2209,7 +2209,4 @@ long reiserfs_compat_ioctl(struct file *
#define reiserfs_write_lock( sb ) lock_kernel()
#define reiserfs_write_unlock( sb ) unlock_kernel()
-/* xattr stuff */
-#define REISERFS_XATTR_DIR_SEM(s) (REISERFS_SB(s)->xattr_dir_sem)
-
#endif /* _LINUX_REISER_FS_H */
--- a/include/linux/reiserfs_fs_sb.h 2007-06-11 14:49:05.000000000 -0400
+++ b/include/linux/reiserfs_fs_sb.h 2007-06-11 14:50:06.000000000 -0400
@@ -403,7 +403,6 @@ struct reiserfs_sb_info {
struct dentry *priv_root; /* root of /.reiserfs_priv */
#ifdef CONFIG_REISERFS_FS_XATTR
struct dentry *xattr_root; /* root of /.reiserfs_priv/.xa */
- struct rw_semaphore xattr_dir_sem;
#endif
int j_errno;
#ifdef CONFIG_QUOTA
--- a/include/linux/reiserfs_xattr.h 2007-06-11 14:49:05.000000000 -0400
+++ b/include/linux/reiserfs_xattr.h 2007-06-11 14:50:07.000000000 -0400
@@ -68,24 +68,6 @@ extern struct reiserfs_xattr_handler sec
int reiserfs_xattr_register_handlers(void) __init;
void reiserfs_xattr_unregister_handlers(void);
-static inline void reiserfs_write_lock_xattrs(struct super_block *sb)
-{
- down_write(&REISERFS_XATTR_DIR_SEM(sb));
-}
-static inline void reiserfs_write_unlock_xattrs(struct super_block *sb)
-{
- up_write(&REISERFS_XATTR_DIR_SEM(sb));
-}
-static inline void reiserfs_read_lock_xattrs(struct super_block *sb)
-{
- down_read(&REISERFS_XATTR_DIR_SEM(sb));
-}
-
-static inline void reiserfs_read_unlock_xattrs(struct super_block *sb)
-{
- up_read(&REISERFS_XATTR_DIR_SEM(sb));
-}
-
static inline void reiserfs_write_lock_xattr_i(struct inode *inode)
{
down_write(&REISERFS_I(inode)->xattr_sem);
--
Jeff Mahoney
SUSE Labs
-
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