helpers for acl caching + switch to those
Al Viro [Tue, 9 Jun 2009 16:11:54 +0000 (12:11 -0400)]
helpers: get_cached_acl(inode, type), set_cached_acl(inode, type, acl),
forget_cached_acl(inode, type).

ubifs/xattr.c needed includes reordered, the rest is a plain switchover.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/btrfs/acl.c
fs/ext2/acl.c
fs/ext3/acl.c
fs/ext4/acl.c
fs/jffs2/acl.c
fs/jfs/acl.c
fs/jfs/xattr.c
fs/reiserfs/xattr_acl.c
fs/ubifs/xattr.c
include/linux/posix_acl.h

index 6db8a42..f128427 100644 (file)
 
 #ifdef CONFIG_FS_POSIX_ACL
 
-static void btrfs_update_cached_acl(struct inode *inode,
-                                   struct posix_acl **p_acl,
-                                   struct posix_acl *acl)
-{
-       spin_lock(&inode->i_lock);
-       if (*p_acl && *p_acl != ACL_NOT_CACHED)
-               posix_acl_release(*p_acl);
-       *p_acl = posix_acl_dup(acl);
-       spin_unlock(&inode->i_lock);
-}
-
 static struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
 {
        int size;
        const char *name;
        char *value = NULL;
-       struct posix_acl *acl = NULL, **p_acl;
+       struct posix_acl *acl;
+
+       acl = get_cached_acl(inode, type);
+       if (acl != ACL_NOT_CACHED)
+               return acl;
 
        switch (type) {
        case ACL_TYPE_ACCESS:
                name = POSIX_ACL_XATTR_ACCESS;
-               p_acl = &inode->i_acl;
                break;
        case ACL_TYPE_DEFAULT:
                name = POSIX_ACL_XATTR_DEFAULT;
-               p_acl = &inode->i_default_acl;
                break;
        default:
-               return ERR_PTR(-EINVAL);
+               BUG();
        }
 
-       /* Handle the cached NULL acl case without locking */
-       acl = ACCESS_ONCE(*p_acl);
-       if (!acl)
-               return acl;
-
-       spin_lock(&inode->i_lock);
-       acl = *p_acl;
-       if (acl != ACL_NOT_CACHED)
-               acl = posix_acl_dup(acl);
-       spin_unlock(&inode->i_lock);
-
-       if (acl != ACL_NOT_CACHED)
-               return acl;
-
        size = __btrfs_getxattr(inode, name, "", 0);
        if (size > 0) {
                value = kzalloc(size, GFP_NOFS);
@@ -82,13 +59,13 @@ static struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
                size = __btrfs_getxattr(inode, name, value, size);
                if (size > 0) {
                        acl = posix_acl_from_xattr(value, size);
-                       btrfs_update_cached_acl(inode, p_acl, acl);
+                       set_cached_acl(inode, type, acl);
                }
                kfree(value);
        } else if (size == -ENOENT || size == -ENODATA || size == 0) {
                /* FIXME, who returns -ENOENT?  I think nobody */
                acl = NULL;
-               btrfs_update_cached_acl(inode, p_acl, acl);
+               set_cached_acl(inode, type, acl);
        } else {
                acl = ERR_PTR(-EIO);
        }
@@ -121,7 +98,6 @@ static int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 {
        int ret, size = 0;
        const char *name;
-       struct posix_acl **p_acl;
        char *value = NULL;
        mode_t mode;
 
@@ -141,13 +117,11 @@ static int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
                ret = 0;
                inode->i_mode = mode;
                name = POSIX_ACL_XATTR_ACCESS;
-               p_acl = &inode->i_acl;
                break;
        case ACL_TYPE_DEFAULT:
                if (!S_ISDIR(inode->i_mode))
                        return acl ? -EINVAL : 0;
                name = POSIX_ACL_XATTR_DEFAULT;
-               p_acl = &inode->i_default_acl;
                break;
        default:
                return -EINVAL;
@@ -172,7 +146,7 @@ out:
        kfree(value);
 
        if (!ret)
-               btrfs_update_cached_acl(inode, p_acl, acl);
+               set_cached_acl(inode, type, acl);
 
        return ret;
 }
index d2ffddc..d636e12 100644 (file)
@@ -125,30 +125,6 @@ fail:
        return ERR_PTR(-EINVAL);
 }
 
-static inline struct posix_acl *
-ext2_iget_acl(struct inode *inode, struct posix_acl **i_acl)
-{
-       struct posix_acl *acl = ACL_NOT_CACHED;
-
-       spin_lock(&inode->i_lock);
-       if (*i_acl != ACL_NOT_CACHED)
-               acl = posix_acl_dup(*i_acl);
-       spin_unlock(&inode->i_lock);
-
-       return acl;
-}
-
-static inline void
-ext2_iset_acl(struct inode *inode, struct posix_acl **i_acl,
-                  struct posix_acl *acl)
-{
-       spin_lock(&inode->i_lock);
-       if (*i_acl != ACL_NOT_CACHED)
-               posix_acl_release(*i_acl);
-       *i_acl = posix_acl_dup(acl);
-       spin_unlock(&inode->i_lock);
-}
-
 /*
  * inode->i_mutex: don't care
  */
@@ -163,23 +139,19 @@ ext2_get_acl(struct inode *inode, int type)
        if (!test_opt(inode->i_sb, POSIX_ACL))
                return NULL;
 
-       switch(type) {
-               case ACL_TYPE_ACCESS:
-                       acl = ext2_iget_acl(inode, &inode->i_acl);
-                       if (acl != ACL_NOT_CACHED)
-                               return acl;
-                       name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
-                       break;
-
-               case ACL_TYPE_DEFAULT:
-                       acl = ext2_iget_acl(inode, &inode->i_default_acl);
-                       if (acl != ACL_NOT_CACHED)
-                               return acl;
-                       name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
-                       break;
-
-               default:
-                       return ERR_PTR(-EINVAL);
+       acl = get_cached_acl(inode, type);
+       if (acl != ACL_NOT_CACHED)
+               return acl;
+
+       switch (type) {
+       case ACL_TYPE_ACCESS:
+               name_index = EXT2_XATTR_INDEX_POSIX_ACL_ACCESS;
+               break;
+       case ACL_TYPE_DEFAULT:
+               name_index = EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT;
+               break;
+       default:
+               BUG();
        }
        retval = ext2_xattr_get(inode, name_index, "", NULL, 0);
        if (retval > 0) {
@@ -196,17 +168,9 @@ ext2_get_acl(struct inode *inode, int type)
                acl = ERR_PTR(retval);
        kfree(value);
 
-       if (!IS_ERR(acl)) {
-               switch(type) {
-                       case ACL_TYPE_ACCESS:
-                               ext2_iset_acl(inode, &inode->i_acl, acl);
-                               break;
+       if (!IS_ERR(acl))
+               set_cached_acl(inode, type, acl);
 
-                       case ACL_TYPE_DEFAULT:
-                               ext2_iset_acl(inode, &inode->i_default_acl, acl);
-                               break;
-               }
-       }
        return acl;
 }
 
@@ -261,17 +225,8 @@ ext2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
        error = ext2_xattr_set(inode, name_index, "", value, size, 0);
 
        kfree(value);
-       if (!error) {
-               switch(type) {
-                       case ACL_TYPE_ACCESS:
-                               ext2_iset_acl(inode, &inode->i_acl, acl);
-                               break;
-
-                       case ACL_TYPE_DEFAULT:
-                               ext2_iset_acl(inode, &inode->i_default_acl, acl);
-                               break;
-               }
-       }
+       if (!error)
+               set_cached_acl(inode, type, acl);
        return error;
 }
 
index a970768..e167bae 100644 (file)
@@ -126,33 +126,6 @@ fail:
        return ERR_PTR(-EINVAL);
 }
 
-static inline struct posix_acl *
-ext3_iget_acl(struct inode *inode, struct posix_acl **i_acl)
-{
-       struct posix_acl *acl = ACCESS_ONCE(*i_acl);
-
-       if (acl) {
-               spin_lock(&inode->i_lock);
-               acl = *i_acl;
-               if (acl != ACL_NOT_CACHED)
-                       acl = posix_acl_dup(acl);
-               spin_unlock(&inode->i_lock);
-       }
-
-       return acl;
-}
-
-static inline void
-ext3_iset_acl(struct inode *inode, struct posix_acl **i_acl,
-                  struct posix_acl *acl)
-{
-       spin_lock(&inode->i_lock);
-       if (*i_acl != ACL_NOT_CACHED)
-               posix_acl_release(*i_acl);
-       *i_acl = posix_acl_dup(acl);
-       spin_unlock(&inode->i_lock);
-}
-
 /*
  * Inode operation get_posix_acl().
  *
@@ -169,24 +142,21 @@ ext3_get_acl(struct inode *inode, int type)
        if (!test_opt(inode->i_sb, POSIX_ACL))
                return NULL;
 
-       switch(type) {
-               case ACL_TYPE_ACCESS:
-                       acl = ext3_iget_acl(inode, &inode->i_acl);
-                       if (acl != ACL_NOT_CACHED)
-                               return acl;
-                       name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS;
-                       break;
-
-               case ACL_TYPE_DEFAULT:
-                       acl = ext3_iget_acl(inode, &inode->i_default_acl);
-                       if (acl != ACL_NOT_CACHED)
-                               return acl;
-                       name_index = EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT;
-                       break;
-
-               default:
-                       return ERR_PTR(-EINVAL);
+       acl = get_cached_acl(inode, type);
+       if (acl != ACL_NOT_CACHED)
+               return acl;
+
+       switch (type) {
+       case ACL_TYPE_ACCESS:
+               name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS;
+               break;
+       case ACL_TYPE_DEFAULT:
+               name_index = EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT;
+               break;
+       default:
+               BUG();
        }
+
        retval = ext3_xattr_get(inode, name_index, "", NULL, 0);
        if (retval > 0) {
                value = kmalloc(retval, GFP_NOFS);
@@ -202,17 +172,9 @@ ext3_get_acl(struct inode *inode, int type)
                acl = ERR_PTR(retval);
        kfree(value);
 
-       if (!IS_ERR(acl)) {
-               switch(type) {
-                       case ACL_TYPE_ACCESS:
-                               ext3_iset_acl(inode, &inode->i_acl, acl);
-                               break;
+       if (!IS_ERR(acl))
+               set_cached_acl(inode, type, acl);
 
-                       case ACL_TYPE_DEFAULT:
-                               ext3_iset_acl(inode, &inode->i_default_acl, acl);
-                               break;
-               }
-       }
        return acl;
 }
 
@@ -269,17 +231,10 @@ ext3_set_acl(handle_t *handle, struct inode *inode, int type,
                                      value, size, 0);
 
        kfree(value);
-       if (!error) {
-               switch(type) {
-                       case ACL_TYPE_ACCESS:
-                               ext3_iset_acl(inode, &inode->i_acl, acl);
-                               break;
 
-                       case ACL_TYPE_DEFAULT:
-                               ext3_iset_acl(inode, &inode->i_default_acl, acl);
-                               break;
-               }
-       }
+       if (!error)
+               set_cached_acl(inode, type, acl);
+
        return error;
 }
 
index 0084e3a..f6d8967 100644 (file)
@@ -126,33 +126,6 @@ fail:
        return ERR_PTR(-EINVAL);
 }
 
-static inline struct posix_acl *
-ext4_iget_acl(struct inode *inode, struct posix_acl **i_acl)
-{
-       struct posix_acl *acl = ACCESS_ONCE(*i_acl);
-
-       if (acl) {
-               spin_lock(&inode->i_lock);
-               acl = *i_acl;
-               if (acl != ACL_NOT_CACHED)
-                       acl = posix_acl_dup(acl);
-               spin_unlock(&inode->i_lock);
-       }
-
-       return acl;
-}
-
-static inline void
-ext4_iset_acl(struct inode *inode, struct posix_acl **i_acl,
-               struct posix_acl *acl)
-{
-       spin_lock(&inode->i_lock);
-       if (*i_acl != ACL_NOT_CACHED)
-               posix_acl_release(*i_acl);
-       *i_acl = posix_acl_dup(acl);
-       spin_unlock(&inode->i_lock);
-}
-
 /*
  * Inode operation get_posix_acl().
  *
@@ -169,23 +142,19 @@ ext4_get_acl(struct inode *inode, int type)
        if (!test_opt(inode->i_sb, POSIX_ACL))
                return NULL;
 
+       acl = get_cached_acl(inode, type);
+       if (acl != ACL_NOT_CACHED)
+               return acl;
+
        switch (type) {
        case ACL_TYPE_ACCESS:
-               acl = ext4_iget_acl(inode, &inode->i_acl);
-               if (acl != ACL_NOT_CACHED)
-                       return acl;
                name_index = EXT4_XATTR_INDEX_POSIX_ACL_ACCESS;
                break;
-
        case ACL_TYPE_DEFAULT:
-               acl = ext4_iget_acl(inode, &inode->i_default_acl);
-               if (acl != ACL_NOT_CACHED)
-                       return acl;
                name_index = EXT4_XATTR_INDEX_POSIX_ACL_DEFAULT;
                break;
-
        default:
-               return ERR_PTR(-EINVAL);
+               BUG();
        }
        retval = ext4_xattr_get(inode, name_index, "", NULL, 0);
        if (retval > 0) {
@@ -202,17 +171,9 @@ ext4_get_acl(struct inode *inode, int type)
                acl = ERR_PTR(retval);
        kfree(value);
 
-       if (!IS_ERR(acl)) {
-               switch (type) {
-               case ACL_TYPE_ACCESS:
-                       ext4_iset_acl(inode, &inode->i_acl, acl);
-                       break;
+       if (!IS_ERR(acl))
+               set_cached_acl(inode, type, acl);
 
-               case ACL_TYPE_DEFAULT:
-                       ext4_iset_acl(inode, &inode->i_default_acl, acl);
-                       break;
-               }
-       }
        return acl;
 }
 
@@ -269,17 +230,9 @@ ext4_set_acl(handle_t *handle, struct inode *inode, int type,
                                      value, size, 0);
 
        kfree(value);
-       if (!error) {
-               switch (type) {
-               case ACL_TYPE_ACCESS:
-                       ext4_iset_acl(inode, &inode->i_acl, acl);
-                       break;
+       if (!error)
+               set_cached_acl(inode, type, acl);
 
-               case ACL_TYPE_DEFAULT:
-                       ext4_iset_acl(inode, &inode->i_default_acl, acl);
-                       break;
-               }
-       }
        return error;
 }
 
index ac16589..edd2ad6 100644 (file)
@@ -156,47 +156,25 @@ static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size)
        return ERR_PTR(-EINVAL);
 }
 
-static struct posix_acl *jffs2_iget_acl(struct inode *inode, struct posix_acl **i_acl)
-{
-       struct posix_acl *acl = ACL_NOT_CACHED;
-
-       spin_lock(&inode->i_lock);
-       if (*i_acl != ACL_NOT_CACHED)
-               acl = posix_acl_dup(*i_acl);
-       spin_unlock(&inode->i_lock);
-       return acl;
-}
-
-static void jffs2_iset_acl(struct inode *inode, struct posix_acl **i_acl, struct posix_acl *acl)
-{
-       spin_lock(&inode->i_lock);
-       if (*i_acl != ACL_NOT_CACHED)
-               posix_acl_release(*i_acl);
-       *i_acl = posix_acl_dup(acl);
-       spin_unlock(&inode->i_lock);
-}
-
 static struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
 {
        struct posix_acl *acl;
        char *value = NULL;
        int rc, xprefix;
 
+       acl = get_cached_acl(inode, type);
+       if (acl != ACL_NOT_CACHED)
+               return acl;
+
        switch (type) {
        case ACL_TYPE_ACCESS:
-               acl = jffs2_iget_acl(inode, &inode->i_acl);
-               if (acl != ACL_NOT_CACHED)
-                       return acl;
                xprefix = JFFS2_XPREFIX_ACL_ACCESS;
                break;
        case ACL_TYPE_DEFAULT:
-               acl = jffs2_iget_acl(inode, &inode->i_default_acl);
-               if (acl != ACL_NOT_CACHED)
-                       return acl;
                xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
                break;
        default:
-               return ERR_PTR(-EINVAL);
+               BUG();
        }
        rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0);
        if (rc > 0) {
@@ -214,16 +192,8 @@ static struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
        }
        if (value)
                kfree(value);
-       if (!IS_ERR(acl)) {
-               switch (type) {
-               case ACL_TYPE_ACCESS:
-                       jffs2_iset_acl(inode, &inode->i_acl, acl);
-                       break;
-               case ACL_TYPE_DEFAULT:
-                       jffs2_iset_acl(inode, &inode->i_default_acl, acl);
-                       break;
-               }
-       }
+       if (!IS_ERR(acl))
+               set_cached_acl(inode, type, acl);
        return acl;
 }
 
@@ -283,16 +253,8 @@ static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
                return -EINVAL;
        }
        rc = __jffs2_set_acl(inode, xprefix, acl);
-       if (!rc) {
-               switch(type) {
-               case ACL_TYPE_ACCESS:
-                       jffs2_iset_acl(inode, &inode->i_acl, acl);
-                       break;
-               case ACL_TYPE_DEFAULT:
-                       jffs2_iset_acl(inode, &inode->i_default_acl, acl);
-                       break;
-               }
-       }
+       if (!rc)
+               set_cached_acl(inode, type, acl);
        return rc;
 }
 
@@ -336,7 +298,7 @@ int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, int *i_mode)
                *i_mode &= ~current_umask();
        } else {
                if (S_ISDIR(*i_mode))
-                       jffs2_iset_acl(inode, &inode->i_default_acl, acl);
+                       set_cached_acl(inode, ACL_TYPE_DEFAULT, acl);
 
                clone = posix_acl_clone(acl, GFP_KERNEL);
                if (!clone)
@@ -347,7 +309,7 @@ int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, int *i_mode)
                        return rc;
                }
                if (rc > 0)
-                       jffs2_iset_acl(inode, &inode->i_acl, clone);
+                       set_cached_acl(inode, ACL_TYPE_ACCESS, clone);
 
                posix_acl_release(clone);
        }
index 5fcfc98..f272bf0 100644 (file)
@@ -31,26 +31,24 @@ static struct posix_acl *jfs_get_acl(struct inode *inode, int type)
 {
        struct posix_acl *acl;
        char *ea_name;
-       struct posix_acl **p_acl;
        int size;
        char *value = NULL;
 
+       acl = get_cached_acl(inode, type);
+       if (acl != ACL_NOT_CACHED)
+               return acl;
+
        switch(type) {
                case ACL_TYPE_ACCESS:
                        ea_name = POSIX_ACL_XATTR_ACCESS;
-                       p_acl = &inode->i_acl;
                        break;
                case ACL_TYPE_DEFAULT:
                        ea_name = POSIX_ACL_XATTR_DEFAULT;
-                       p_acl = &inode->i_default_acl;
                        break;
                default:
                        return ERR_PTR(-EINVAL);
        }
 
-       if (*p_acl != ACL_NOT_CACHED)
-               return posix_acl_dup(*p_acl);
-
        size = __jfs_getxattr(inode, ea_name, NULL, 0);
 
        if (size > 0) {
@@ -61,17 +59,18 @@ static struct posix_acl *jfs_get_acl(struct inode *inode, int type)
        }
 
        if (size < 0) {
-               if (size == -ENODATA) {
-                       *p_acl = NULL;
+               if (size == -ENODATA)
                        acl = NULL;
-               } else
+               else
                        acl = ERR_PTR(size);
        } else {
                acl = posix_acl_from_xattr(value, size);
-               if (!IS_ERR(acl))
-                       *p_acl = posix_acl_dup(acl);
        }
        kfree(value);
+       if (!IS_ERR(acl)) {
+               set_cached_acl(inode, type, acl);
+               posix_acl_release(acl);
+       }
        return acl;
 }
 
@@ -79,7 +78,6 @@ static int jfs_set_acl(tid_t tid, struct inode *inode, int type,
                       struct posix_acl *acl)
 {
        char *ea_name;
-       struct posix_acl **p_acl;
        int rc;
        int size = 0;
        char *value = NULL;
@@ -90,11 +88,9 @@ static int jfs_set_acl(tid_t tid, struct inode *inode, int type,
        switch(type) {
                case ACL_TYPE_ACCESS:
                        ea_name = POSIX_ACL_XATTR_ACCESS;
-                       p_acl = &inode->i_acl;
                        break;
                case ACL_TYPE_DEFAULT:
                        ea_name = POSIX_ACL_XATTR_DEFAULT;
-                       p_acl = &inode->i_default_acl;
                        if (!S_ISDIR(inode->i_mode))
                                return acl ? -EACCES : 0;
                        break;
@@ -114,11 +110,9 @@ static int jfs_set_acl(tid_t tid, struct inode *inode, int type,
 out:
        kfree(value);
 
-       if (!rc) {
-               if (*p_acl && (*p_acl != ACL_NOT_CACHED))
-                       posix_acl_release(*p_acl);
-               *p_acl = posix_acl_dup(acl);
-       }
+       if (!rc)
+               set_cached_acl(inode, type, acl);
+
        return rc;
 }
 
index f6e90e3..fad3645 100644 (file)
@@ -727,10 +727,7 @@ static int can_set_system_xattr(struct inode *inode, const char *name,
                /*
                 * We're changing the ACL.  Get rid of the cached one
                 */
-               acl =inode->i_acl;
-               if (acl != ACL_NOT_CACHED)
-                       posix_acl_release(acl);
-               inode->i_acl = ACL_NOT_CACHED;
+               forget_cached_acl(inode, ACL_TYPE_ACCESS);
 
                return 0;
        } else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) {
@@ -746,10 +743,7 @@ static int can_set_system_xattr(struct inode *inode, const char *name,
                /*
                 * We're changing the default ACL.  Get rid of the cached one
                 */
-               acl = inode->i_default_acl;
-               if (acl && (acl != ACL_NOT_CACHED))
-                       posix_acl_release(acl);
-               inode->i_default_acl = ACL_NOT_CACHED;
+               forget_cached_acl(inode, ACL_TYPE_DEFAULT);
 
                return 0;
        }
index b6e473f..35d6e67 100644 (file)
@@ -188,29 +188,6 @@ static void *posix_acl_to_disk(const struct posix_acl *acl, size_t * size)
        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 != ACL_NOT_CACHED)
-               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 = ACL_NOT_CACHED;
-
-       spin_lock(&inode->i_lock);
-       if (*i_acl != ACL_NOT_CACHED)
-               acl = posix_acl_dup(*i_acl);
-       spin_unlock(&inode->i_lock);
-
-       return acl;
-}
-
 /*
  * Inode operation get_posix_acl().
  *
@@ -220,31 +197,29 @@ static inline struct posix_acl *iget_acl(struct inode *inode,
 struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
 {
        char *name, *value;
-       struct posix_acl *acl, **p_acl;
+       struct posix_acl *acl;
        int size;
        int retval;
 
+       acl = get_cached_acl(inode, type);
+       if (acl != ACL_NOT_CACHED)
+               return acl;
+
        switch (type) {
        case ACL_TYPE_ACCESS:
                name = POSIX_ACL_XATTR_ACCESS;
-               p_acl = &inode->i_acl;
                break;
        case ACL_TYPE_DEFAULT:
                name = POSIX_ACL_XATTR_DEFAULT;
-               p_acl = &inode->i_default_acl;
                break;
        default:
-               return ERR_PTR(-EINVAL);
+               BUG();
        }
 
-       acl = iget_acl(inode, p_acl);
-       if (acl != ACL_NOT_CACHED)
-               return acl;
-
        size = reiserfs_xattr_get(inode, name, NULL, 0);
        if (size < 0) {
                if (size == -ENODATA || size == -ENOSYS) {
-                       *p_acl = NULL;
+                       set_cached_acl(inode, type, NULL);
                        return NULL;
                }
                return ERR_PTR(size);
@@ -259,14 +234,13 @@ struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
                /* This shouldn't actually happen as it should have
                   been caught above.. but just in case */
                acl = NULL;
-               *p_acl = acl;
        } else if (retval < 0) {
                acl = ERR_PTR(retval);
        } else {
                acl = posix_acl_from_disk(value, retval);
-               if (!IS_ERR(acl))
-                       iset_acl(inode, p_acl, acl);
        }
+       if (!IS_ERR(acl))
+               set_cached_acl(inode, type, acl);
 
        kfree(value);
        return acl;
@@ -284,7 +258,6 @@ reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode,
 {
        char *name;
        void *value = NULL;
-       struct posix_acl **p_acl;
        size_t size = 0;
        int error;
 
@@ -294,7 +267,6 @@ reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode,
        switch (type) {
        case ACL_TYPE_ACCESS:
                name = POSIX_ACL_XATTR_ACCESS;
-               p_acl = &inode->i_acl;
                if (acl) {
                        mode_t mode = inode->i_mode;
                        error = posix_acl_equiv_mode(acl, &mode);
@@ -309,7 +281,6 @@ reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode,
                break;
        case ACL_TYPE_DEFAULT:
                name = POSIX_ACL_XATTR_DEFAULT;
-               p_acl = &inode->i_default_acl;
                if (!S_ISDIR(inode->i_mode))
                        return acl ? -EACCES : 0;
                break;
@@ -342,7 +313,7 @@ reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode,
        kfree(value);
 
        if (!error)
-               iset_acl(inode, p_acl, acl);
+               set_cached_acl(inode, type, acl);
 
        return error;
 }
index cfd31e2..adafcf5 100644 (file)
@@ -55,9 +55,9 @@
  * ACL support is not implemented.
  */
 
+#include "ubifs.h"
 #include <linux/xattr.h>
 #include <linux/posix_acl_xattr.h>
-#include "ubifs.h"
 
 /*
  * Limit the number of extended attributes per inode so that the total size
index 4bc2412..0cdba01 100644 (file)
@@ -83,4 +83,68 @@ extern int posix_acl_chmod_masq(struct posix_acl *, mode_t);
 extern struct posix_acl *get_posix_acl(struct inode *, int);
 extern int set_posix_acl(struct inode *, int, struct posix_acl *);
 
+static inline struct posix_acl *get_cached_acl(struct inode *inode, int type)
+{
+       struct posix_acl **p, *acl;
+       switch (type) {
+       case ACL_TYPE_ACCESS:
+               p = &inode->i_acl;
+               break;
+       case ACL_TYPE_DEFAULT:
+               p = &inode->i_default_acl;
+               break;
+       default:
+               return ERR_PTR(-EINVAL);
+       }
+       acl = ACCESS_ONCE(*p);
+       if (acl) {
+               spin_lock(&inode->i_lock);
+               acl = *p;
+               if (acl != ACL_NOT_CACHED)
+                       acl = posix_acl_dup(acl);
+               spin_unlock(&inode->i_lock);
+       }
+       return acl;
+}
+
+static inline void set_cached_acl(struct inode *inode,
+                                 int type,
+                                 struct posix_acl *acl)
+{
+       struct posix_acl *old = NULL;
+       spin_lock(&inode->i_lock);
+       switch (type) {
+       case ACL_TYPE_ACCESS:
+               old = inode->i_acl;
+               inode->i_acl = posix_acl_dup(acl);
+               break;
+       case ACL_TYPE_DEFAULT:
+               old = inode->i_default_acl;
+               inode->i_default_acl = posix_acl_dup(acl);
+               break;
+       }
+       spin_unlock(&inode->i_lock);
+       if (old != ACL_NOT_CACHED)
+               posix_acl_release(old);
+}
+
+static inline void forget_cached_acl(struct inode *inode, int type)
+{
+       struct posix_acl *old = NULL;
+       spin_lock(&inode->i_lock);
+       switch (type) {
+       case ACL_TYPE_ACCESS:
+               old = inode->i_acl;
+               inode->i_acl = ACL_NOT_CACHED;
+               break;
+       case ACL_TYPE_DEFAULT:
+               old = inode->i_default_acl;
+               inode->i_default_acl = ACL_NOT_CACHED;
+               break;
+       }
+       spin_unlock(&inode->i_lock);
+       if (old != ACL_NOT_CACHED)
+               posix_acl_release(old);
+}
+
 #endif  /* __LINUX_POSIX_ACL_H */