ext4: restructure ext4_expand_extra_isize

Current ext4_expand_extra_isize just tries to expand extra isize, if
someone is holding xattr lock or some check fails, it will give up.
So rename its name to ext4_try_to_expand_extra_isize.

Besides that, we clean up unnecessary check and move some relative checks
into it.

Signed-off-by: Miao Xie <miaoxie@huawei.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Wang Shilong <wshilong@ddn.com>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5dabbf2..713b67e 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5706,21 +5706,35 @@ ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
  * Expand an inode by new_extra_isize bytes.
  * Returns 0 on success or negative error number on failure.
  */
-static int ext4_expand_extra_isize(struct inode *inode,
-                                  unsigned int new_extra_isize,
-                                  struct ext4_iloc iloc,
-                                  handle_t *handle)
+static int ext4_try_to_expand_extra_isize(struct inode *inode,
+                                         unsigned int new_extra_isize,
+                                         struct ext4_iloc iloc,
+                                         handle_t *handle)
 {
        struct ext4_inode *raw_inode;
        struct ext4_xattr_ibody_header *header;
        int no_expand;
        int error;
 
-       if (EXT4_I(inode)->i_extra_isize >= new_extra_isize)
-               return 0;
+       if (ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND))
+               return -EOVERFLOW;
+
+       /*
+        * In nojournal mode, we can immediately attempt to expand
+        * the inode.  When journaled, we first need to obtain extra
+        * buffer credits since we may write into the EA block
+        * with this same handle. If journal_extend fails, then it will
+        * only result in a minor loss of functionality for that inode.
+        * If this is felt to be critical, then e2fsck should be run to
+        * force a large enough s_min_extra_isize.
+        */
+       if (ext4_handle_valid(handle) &&
+           jbd2_journal_extend(handle,
+                               EXT4_DATA_TRANS_BLOCKS(inode->i_sb)) != 0)
+               return -ENOSPC;
 
        if (ext4_write_trylock_xattr(inode, &no_expand) == 0)
-               return 0;
+               return -EBUSY;
 
        raw_inode = ext4_raw_inode(&iloc);
 
@@ -5747,6 +5761,7 @@ static int ext4_expand_extra_isize(struct inode *inode,
                no_expand = 1;
        }
        ext4_write_unlock_xattr(inode, &no_expand);
+
        return error;
 }
 
@@ -5767,44 +5782,18 @@ int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode)
 {
        struct ext4_iloc iloc;
        struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
-       static unsigned int mnt_count;
-       int err, ret;
+       int err;
 
        might_sleep();
        trace_ext4_mark_inode_dirty(inode, _RET_IP_);
        err = ext4_reserve_inode_write(handle, inode, &iloc);
        if (err)
                return err;
-       if (EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize &&
-           !ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND)) {
-               /*
-                * In nojournal mode, we can immediately attempt to expand
-                * the inode.  When journaled, we first need to obtain extra
-                * buffer credits since we may write into the EA block
-                * with this same handle. If journal_extend fails, then it will
-                * only result in a minor loss of functionality for that inode.
-                * If this is felt to be critical, then e2fsck should be run to
-                * force a large enough s_min_extra_isize.
-                */
-               if (!ext4_handle_valid(handle) ||
-                   jbd2_journal_extend(handle,
-                            EXT4_DATA_TRANS_BLOCKS(inode->i_sb)) == 0) {
-                       ret = ext4_expand_extra_isize(inode,
-                                                     sbi->s_want_extra_isize,
-                                                     iloc, handle);
-                       if (ret) {
-                               if (mnt_count !=
-                                       le16_to_cpu(sbi->s_es->s_mnt_count)) {
-                                       ext4_warning(inode->i_sb,
-                                       "Unable to expand inode %lu. Delete"
-                                       " some EAs or run e2fsck.",
-                                       inode->i_ino);
-                                       mnt_count =
-                                         le16_to_cpu(sbi->s_es->s_mnt_count);
-                               }
-                       }
-               }
-       }
+
+       if (EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize)
+               ext4_try_to_expand_extra_isize(inode, sbi->s_want_extra_isize,
+                                              iloc, handle);
+
        return ext4_mark_iloc_dirty(handle, inode, &iloc);
 }
 

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 862ba38..7f5f4b6 100644 (file)
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -2638,12 +2638,14 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
 {
        struct ext4_xattr_ibody_header *header;
        struct buffer_head *bh = NULL;
+       struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
+       static unsigned int mnt_count;
        size_t min_offs;
        size_t ifree, bfree;
        int total_ino;
        void *base, *end;
        int error = 0, tried_min_extra_isize = 0;
-       int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize);
+       int s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize);
        int isize_diff; /* How much do we need to grow i_extra_isize */
 
 retry:
@@ -2731,6 +2733,11 @@ out:
 
 cleanup:
        brelse(bh);
+       if (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count)) {
+               ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.",
+                            inode->i_ino);
+               mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count);
+       }
        return error;
 }