Export xattr_resolve_name and make it easier to use by filesystems.
Use it to remove reiserfs's own copy of the same functionality.
Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
---
fs/reiserfs/xattr.c | 47 +++++++----------------------------------------
fs/xattr.c | 20 ++++++++++++--------
include/linux/xattr.h | 4 ++++
3 files changed, 23 insertions(+), 48 deletions(-)
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 28f5f8b..08b8dc4 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -732,40 +732,6 @@ out:
}
/*
- * In order to implement different sets of xattr operations for each xattr
- * prefix with the generic xattr API, a filesystem should create a
- * null-terminated array of struct xattr_handler (one for each prefix) and
- * hang a pointer to it off of the s_xattr field of the superblock.
- *
- * The generic_fooxattr() functions will use this list to dispatch xattr
- * operations to the correct xattr_handler.
- */
-#define for_each_xattr_handler(handlers, handler) \
- for ((handler) = *(handlers)++; \
- (handler) != NULL; \
- (handler) = *(handlers)++)
-
-/* This is the implementation for the xattr plugin infrastructure */
-static inline const struct xattr_handler *
-find_xattr_handler_prefix(const struct xattr_handler **handlers,
- const char *name)
-{
- const struct xattr_handler *xah;
-
- if (!handlers)
- return NULL;
-
- for_each_xattr_handler(handlers, xah) {
- const char *prefix = xattr_prefix(xah);
- if (strncmp(prefix, name, strlen(prefix)) == 0)
- break;
- }
-
- return xah;
-}
-
-
-/*
* Inode operation getxattr()
*/
ssize_t
@@ -774,7 +740,9 @@ reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
{
const struct xattr_handler *handler;
- handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
+ handler = xattr_resolve_name(dentry->d_sb, name, NULL);
+ if (IS_ERR(handler))
+ return PTR_ERR(handler);
if (!handler || get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
return -EOPNOTSUPP;
@@ -793,7 +761,7 @@ reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
{
const struct xattr_handler *handler;
- handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
+ handler = xattr_resolve_name(dentry->d_sb, name, NULL);
if (!handler || get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
return -EOPNOTSUPP;
@@ -810,7 +778,7 @@ int reiserfs_removexattr(struct dentry *dentry, const char *name)
{
const struct xattr_handler *handler;
- handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
+ handler = xattr_resolve_name(dentry->d_sb, name, NULL);
if (!handler || get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
return -EOPNOTSUPP;
@@ -838,9 +806,8 @@ static int listxattr_filler(struct dir_context *ctx, const char *name,
(namelen != 1 && (name[1] != '.' || namelen != 2))) {
const struct xattr_handler *handler;
- handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr,
- name);
- if (!handler /* Unsupported xattr name */ ||
+ handler = xattr_resolve_name(b->dentry->d_sb, name, NULL);
+ if (IS_ERR(handler) /* Unsupported xattr name */ ||
(handler->list && !handler->list(b->dentry)))
return 0;
size = namelen + 1;
diff --git a/fs/xattr.c b/fs/xattr.c
index afadc1b..096a3fc 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -655,30 +655,34 @@ strcmp_prefix(const char *a, const char *a_prefix)
/*
* Find the xattr_handler with the matching prefix.
*/
-static const struct xattr_handler *
-xattr_resolve_name(const struct xattr_handler **handlers, const char **name)
+const struct xattr_handler *
+xattr_resolve_name(const struct super_block *sb, const char *name,
+ const char **suffix)
{
+ const struct xattr_handler **handlers = sb->s_xattr;
const struct xattr_handler *handler;
- if (!*name)
+ if (!name)
return ERR_PTR(-EINVAL);
for_each_xattr_handler(handlers, handler) {
const char *n;
- n = strcmp_prefix(*name, xattr_prefix(handler));
+ n = strcmp_prefix(name, xattr_prefix(handler));
if (n) {
if (!handler->prefix ^ !*n) {
if (*n)
continue;
return ERR_PTR(-EINVAL);
}
- *name = n;
+ if (suffix)
+ *suffix = n;
return handler;
}
}
return ERR_PTR(-EOPNOTSUPP);
}
+EXPORT_SYMBOL(xattr_resolve_name);
/*
* Find the handler for the prefix and dispatch its get() operation.
@@ -688,7 +692,7 @@ generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t s
{
const struct xattr_handler *handler;
- handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
+ handler = xattr_resolve_name(dentry->d_sb, name, &name);
if (IS_ERR(handler))
return PTR_ERR(handler);
return handler->get(handler, dentry, name, buffer, size);
@@ -741,7 +745,7 @@ generic_setxattr(struct dentry *dentry, const char *name, const void *value, siz
if (size == 0)
value = ""; /* empty EA, do not remove */
- handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
+ handler = xattr_resolve_name(dentry->d_sb, name, &name);
if (IS_ERR(handler))
return PTR_ERR(handler);
return handler->set(handler, dentry, name, value, size, flags);
@@ -756,7 +760,7 @@ generic_removexattr(struct dentry *dentry, const char *name)
{
const struct xattr_handler *handler;
- handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
+ handler = xattr_resolve_name(dentry->d_sb, name, &name);
if (IS_ERR(handler))
return PTR_ERR(handler);
return handler->set(handler, dentry, name, NULL, 0, XATTR_REPLACE);
diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index 4457541..0a53a17 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -51,6 +51,10 @@ int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, i
int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
int vfs_removexattr(struct dentry *, const char *);
+struct super_block;
+const struct xattr_handler *xattr_resolve_name(const struct super_block *,
+ const char *name,
+ const char **suffix);
ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size);
ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
--
2.5.5
--
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