static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char
*prefix);
-static struct dentry *create_xa_root(struct super_block *sb)
+/* Returns the dentry referring to the root of the extended attribute
+ * directory tree. If it has already been retrieved, it is used. If it
+ * hasn't been created and the flags indicate creation is allowed, we
+ * attempt to create it. On error, we return a pointer-encoded error.
+ */
+static struct dentry *get_xa_root(struct super_block *sb, int flags)
{
struct dentry *privroot = dget(REISERFS_SB(sb)->priv_root);
struct dentry *xaroot;
/* This needs to be created at mount-time */
if (!privroot)
- return ERR_PTR(-EOPNOTSUPP);
+ return ERR_PTR(-ENODATA);
- xaroot = lookup_one_len(XAROOT_NAME, privroot, strlen(XAROOT_NAME));
- if (IS_ERR(xaroot)) {
+ mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR);
+ if (REISERFS_SB(sb)->xattr_root) {
+ xaroot = dget(REISERFS_SB(sb)->xattr_root);
goto out;
- } else if (!xaroot->d_inode) {
- int err;
- mutex_lock(&privroot->d_inode->i_mutex);
- err =
- privroot->d_inode->i_op->mkdir(privroot->d_inode, xaroot,
- 0700);
- mutex_unlock(&privroot->d_inode->i_mutex);
-
- if (err) {
- dput(xaroot);
- dput(privroot);
- return ERR_PTR(err);
- }
- REISERFS_SB(sb)->xattr_root = dget(xaroot);
}
- out:
- dput(privroot);
- return xaroot;
-}
-
-/* This will return a dentry, or error, refering to the xa root directory.
- * If the xa root doesn't exist yet, the dentry will be returned without
- * an associated inode. This dentry can be used with ->mkdir to create
- * the xa directory. */
-static struct dentry *__get_xa_root(struct super_block *s)
-{
- struct dentry *privroot = dget(REISERFS_SB(s)->priv_root);
- struct dentry *xaroot = NULL;
-
- if (IS_ERR(privroot) || !privroot)
- return privroot;
-
xaroot = lookup_one_len(XAROOT_NAME, privroot, strlen(XAROOT_NAME));
if (IS_ERR(xaroot)) {
goto out;
} else if (!xaroot->d_inode) {
- dput(xaroot);
- xaroot = NULL;
- goto out;
+ int err = -ENODATA;
+ if (flags == 0 || flags & XATTR_CREATE)
+ err = privroot->d_inode->i_op->mkdir(privroot->d_inode,
+ xaroot, 0700);
+ if (err) {
+ dput(xaroot);
+ xaroot = ERR_PTR(err);
+ goto out;
+ }
}
-
- REISERFS_SB(s)->xattr_root = dget(xaroot);
+ REISERFS_SB(sb)->xattr_root = dget(xaroot);
out:
+ mutex_unlock(&privroot->d_inode->i_mutex);
dput(privroot);
return xaroot;
}
-/* Returns the dentry (or NULL) referring to the root of the extended
- * attribute directory tree. If it has already been retrieved, it is used.
- * Otherwise, we attempt to retrieve it from disk. It may also return
- * a pointer-encoded error.
- */
-static inline struct dentry *get_xa_root(struct super_block *s)
-{
- struct dentry *dentry = dget(REISERFS_SB(s)->xattr_root);
-
- if (!dentry)
- dentry = __get_xa_root(s);
-
- return dentry;
-}
-
/* Opens the directory corresponding to the inode's extended attribute store.
* If flags allow, the tree to the directory may be created. If creation is
* prohibited, -ENODATA is returned. */
struct dentry *xaroot, *xadir;
char namebuf[17];
- xaroot = get_xa_root(inode->i_sb);
- if (IS_ERR(xaroot)) {
+ xaroot = get_xa_root(inode->i_sb, flags);
+ if (IS_ERR(xaroot))
return xaroot;
- } else if (!xaroot) {
- if (flags == 0 || flags & XATTR_CREATE) {
- xaroot = create_xa_root(inode->i_sb);
- if (IS_ERR(xaroot))
- return xaroot;
- }
- if (!xaroot)
- return ERR_PTR(-ENODATA);
- }
/* ok, we have xaroot open */
-
snprintf(namebuf, sizeof(namebuf), "%X.%X",
le32_to_cpu(INODE_PKEY(inode)->k_objectid),
inode->i_generation);
mapping_set_gfp_mask(mapping, GFP_NOFS);
page = read_mapping_page(mapping, n, NULL);
if (!IS_ERR(page)) {
- wait_on_page_locked(page);
kmap(page);
- if (!PageUptodate(page))
- goto fail;
-
if (PageError(page))
goto fail;
}
return csum_partial(msg, len, 0);
}
+int reiserfs_commit_write(struct file *f, struct page *page,
+ unsigned from, unsigned to);
+int reiserfs_prepare_write(struct file *f, struct page *page,
+ unsigned from, unsigned to);
+
+
/* Generic extended attribute operations that can be used by xa plugins */
/*
/* Resize it so we're ok to write there */
newattrs.ia_size = buffer_size;
newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
- mutex_lock(&xinode->i_mutex);
+ mutex_lock_nested(&xinode->i_mutex, I_MUTEX_XATTR);
err = notify_change(fp->f_path.dentry, &newattrs);
if (err)
goto out_filp;
rxh->h_hash = cpu_to_le32(xahash);
}
- err = mapping->a_ops->prepare_write(fp, page, page_offset,
- page_offset + chunk + skip);
+ err = reiserfs_prepare_write(fp, page, page_offset,
+ page_offset + chunk + skip);
if (!err) {
if (buffer)
memcpy(data + skip, buffer + buffer_pos, chunk);
err =
- mapping->a_ops->commit_write(fp, page, page_offset,
- page_offset + chunk +
- skip);
+ reiserfs_commit_write(fp, page, page_offset,
+ page_offset + chunk +
+ skip);
}
unlock_page(page);
reiserfs_put_page(page);
/* Leftovers besides . and .. -- that's not good. */
if (dir->d_inode->i_nlink <= 2) {
- root = get_xa_root(inode->i_sb);
+ root = get_xa_root(inode->i_sb, XATTR_REPLACE);
reiserfs_write_lock_xattrs(inode->i_sb);
err = vfs_rmdir(root->d_inode, dir);
reiserfs_write_unlock_xattrs(inode->i_sb);
}
/* This is the implementation for the xattr plugin infrastructure */
-static struct list_head xattr_handlers = LIST_HEAD_INIT(xattr_handlers);
+static LIST_HEAD(xattr_handlers);
static DEFINE_RWLOCK(handler_lock);
static struct reiserfs_xattr_handler *find_xattr_handler_prefix(const char
if (!IS_ERR(dentry)) {
if (!(mount_flags & MS_RDONLY) && !dentry->d_inode) {
struct inode *inode = dentry->d_parent->d_inode;
- mutex_lock(&inode->i_mutex);
+ mutex_lock_nested(&inode->i_mutex,
+ I_MUTEX_XATTR);
err = inode->i_op->mkdir(inode, dentry, 0700);
mutex_unlock(&inode->i_mutex);
if (err) {
projects / linux-2.6-omap-h63xx.git / blobdiff