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f2fs: introduce __find_xattr for readability 

The __find_xattr is to search the wanted xattr entry starting from the
base_addr.

If not found, the returned entry is the last empty xattr entry that can be
allocated newly.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2013-08-13 10:13:55 +09:00
parent de93653fe3
commit dd9cfe236f
2 changed files with 22 additions and 27 deletions

46
fs/f2fs/xattr.c
View File

@ -246,6 +246,22 @@ static inline const struct xattr_handler *f2fs_xattr_handler(int name_index)
return handler; return handler;
} }
static struct f2fs_xattr_entry *__find_xattr(void *base_addr, int name_index,
size_t name_len, const char *name)
{
struct f2fs_xattr_entry *entry;
list_for_each_xattr(entry, base_addr) {
if (entry->e_name_index != name_index)
continue;
if (entry->e_name_len != name_len)
continue;
if (!memcmp(entry->e_name, name, name_len))
break;
}
return entry;
}
int f2fs_getxattr(struct inode *inode, int name_index, const char *name, int f2fs_getxattr(struct inode *inode, int name_index, const char *name,
void *buffer, size_t buffer_size) void *buffer, size_t buffer_size)
{ {
@ -253,8 +269,7 @@ int f2fs_getxattr(struct inode *inode, int name_index, const char *name,
struct f2fs_inode_info *fi = F2FS_I(inode); struct f2fs_inode_info *fi = F2FS_I(inode);
struct f2fs_xattr_entry *entry; struct f2fs_xattr_entry *entry;
struct page *page; struct page *page;
void *base_addr; int error = 0;
int error = 0, found = 0;
size_t value_len, name_len; size_t value_len, name_len;
if (name == NULL) if (name == NULL)
@ -267,19 +282,9 @@ int f2fs_getxattr(struct inode *inode, int name_index, const char *name,
page = get_node_page(sbi, fi->i_xattr_nid); page = get_node_page(sbi, fi->i_xattr_nid);
if (IS_ERR(page)) if (IS_ERR(page))
return PTR_ERR(page); return PTR_ERR(page);
base_addr = page_address(page);
list_for_each_xattr(entry, base_addr) { entry = __find_xattr(page_address(page), name_index, name_len, name);
if (entry->e_name_index != name_index) if (IS_XATTR_LAST_ENTRY(entry)) {
continue;
if (entry->e_name_len != name_len)
continue;
if (!memcmp(entry->e_name, name, name_len)) {
found = 1;
break;
}
}
if (!found) {
error = -ENODATA; error = -ENODATA;
goto cleanup; goto cleanup;
} }
@ -417,18 +422,9 @@ int f2fs_setxattr(struct inode *inode, int name_index, const char *name,
} }
/* find entry with wanted name. */ /* find entry with wanted name. */
found = 0; here = __find_xattr(base_addr, name_index, name_len, name);
list_for_each_xattr(here, base_addr) {
if (here->e_name_index != name_index)
continue;
if (here->e_name_len != name_len)
continue;
if (!memcmp(here->e_name, name, name_len)) {
found = 1;
break;
}
}
found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
last = here; last = here;
while (!IS_XATTR_LAST_ENTRY(last)) while (!IS_XATTR_LAST_ENTRY(last))

3
fs/f2fs/xattr.h
View File

@ -51,7 +51,7 @@ struct f2fs_xattr_entry {
#define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr)) #define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr))
#define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr)) #define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr))
#define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr)+1)) #define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr) + 1))
#define XATTR_ROUND (3) #define XATTR_ROUND (3)
#define XATTR_ALIGN(size) ((size + XATTR_ROUND) & ~XATTR_ROUND) #define XATTR_ALIGN(size) ((size + XATTR_ROUND) & ~XATTR_ROUND)
@ -69,7 +69,6 @@ struct f2fs_xattr_entry {
!IS_XATTR_LAST_ENTRY(entry);\ !IS_XATTR_LAST_ENTRY(entry);\
entry = XATTR_NEXT_ENTRY(entry)) entry = XATTR_NEXT_ENTRY(entry))
#define MIN_OFFSET XATTR_ALIGN(PAGE_SIZE - \ #define MIN_OFFSET XATTR_ALIGN(PAGE_SIZE - \
sizeof(struct node_footer) - \ sizeof(struct node_footer) - \
sizeof(__u32)) sizeof(__u32))