1 files changed, 51 insertions, 0 deletions

diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
index 5324d1e9d168..7d52e8dc0c59 100644
--- a/fs/f2fs/xattr.c
+++ b/fs/f2fs/xattr.c
@@ -102,6 +102,49 @@ static int f2fs_xattr_generic_set(struct dentry *dentry, const char *name,
         return f2fs_setxattr(dentry->d_inode, type, name, value, size);
 }
 
+static size_t f2fs_xattr_advise_list(struct dentry *dentry, char *list,
+                size_t list_size, const char *name, size_t name_len, int type)
+{
+        const char *xname = F2FS_SYSTEM_ADVISE_PREFIX;
+        size_t size;
+
+        if (type != F2FS_XATTR_INDEX_ADVISE)
+                return 0;
+
+        size = strlen(xname) + 1;
+        if (list && size <= list_size)
+                memcpy(list, xname, size);
+        return size;
+}
+
+static int f2fs_xattr_advise_get(struct dentry *dentry, const char *name,
+                void *buffer, size_t size, int type)
+{
+        struct inode *inode = dentry->d_inode;
+
+        if (strcmp(name, "") != 0)
+                return -EINVAL;
+
+        *((char *)buffer) = F2FS_I(inode)->i_advise;
+        return sizeof(char);
+}
+
+static int f2fs_xattr_advise_set(struct dentry *dentry, const char *name,
+                const void *value, size_t size, int flags, int type)
+{
+        struct inode *inode = dentry->d_inode;
+
+        if (strcmp(name, "") != 0)
+                return -EINVAL;
+        if (!inode_owner_or_capable(inode))
+                return -EPERM;
+        if (value == NULL)
+                return -EINVAL;
+
+        F2FS_I(inode)->i_advise |= *(char *)value;
+        return 0;
+}
+
 const struct xattr_handler f2fs_xattr_user_handler = {
         .prefix = XATTR_USER_PREFIX,
         .flags  = F2FS_XATTR_INDEX_USER,
@@ -118,6 +161,14 @@ const struct xattr_handler f2fs_xattr_trusted_handler = {
         .set    = f2fs_xattr_generic_set,
 };
 
+const struct xattr_handler f2fs_xattr_advise_handler = {
+        .prefix = F2FS_SYSTEM_ADVISE_PREFIX,
+        .flags  = F2FS_XATTR_INDEX_ADVISE,
+        .list   = f2fs_xattr_advise_list,
+        .get    = f2fs_xattr_advise_get,
+        .set    = f2fs_xattr_advise_set,
+};
+
 static const struct xattr_handler *f2fs_xattr_handler_map[] = {
         [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
 #ifdef CONFIG_F2FS_FS_POSIX_ACL