ext4: prepare to drop EXT4_STATE_DELALLOC_RESERVED

The EXT4_STATE_DELALLOC_RESERVED flag was originally implemented
because it was too hard to make sure the mballoc and get_block flags
could be reliably passed down through all of the codepaths that end up
calling ext4_mb_new_blocks().

Since then, we have mb_flags passed down through most of the code
paths, so getting rid of EXT4_STATE_DELALLOC_RESERVED isn't as tricky
as it used to.

This commit plumbs in the last of what is required, and then adds a
WARN_ON check to make sure we haven't missed anything.  If this passes
a full regression test run, we can then drop
EXT4_STATE_DELALLOC_RESERVED.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>

5 files changed, 17 insertions, 14 deletions

diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 581ef40fbe90..d70f154f6da3 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -636,8 +636,7 @@ ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
          * Account for the allocated meta blocks.  We will never
          * fail EDQUOT for metdata, but we do account for it.
          */
-        if (!(*errp) &&
-            ext4_test_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED)) {
+        if (!(*errp) && (flags & EXT4_MB_DELALLOC_RESERVED)) {
                 spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
                 spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
                 dquot_alloc_block_nofail(inode,
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 3ac1686efff8..8170b3254767 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -1933,6 +1933,8 @@ int ext4_ext_insert_extent(handle_t *handle, struct inode *inode,
         ext4_lblk_t next;
         int mb_flags = 0, unwritten;
 
+        if (gb_flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
+                mb_flags |= EXT4_MB_DELALLOC_RESERVED;
         if (unlikely(ext4_ext_get_actual_len(newext) == 0)) {
                 EXT4_ERROR_INODE(inode, "ext4_ext_get_actual_len(newext) == 0");
                 return -EIO;
@@ -2054,7 +2056,7 @@ prepend:
          * We're gonna add a new leaf in the tree.
          */
         if (gb_flags & EXT4_GET_BLOCKS_METADATA_NOFAIL)
-                mb_flags = EXT4_MB_USE_RESERVED;
+                mb_flags |= EXT4_MB_USE_RESERVED;
         err = ext4_ext_create_new_leaf(handle, inode, mb_flags, gb_flags,
                                        ppath, newext);
         if (err)
@@ -4438,6 +4440,8 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
                 ar.flags = 0;
         if (flags & EXT4_GET_BLOCKS_NO_NORMALIZE)
                 ar.flags |= EXT4_MB_HINT_NOPREALLOC;
+        if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
+                ar.flags |= EXT4_MB_DELALLOC_RESERVED;
         newblock = ext4_mb_new_blocks(handle, &ar, &err);
         if (!newblock)
                 goto out2;
diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
index 69af0cd64724..36b369697a13 100644
--- a/fs/ext4/indirect.c
+++ b/fs/ext4/indirect.c
@@ -333,7 +333,9 @@ static int ext4_alloc_branch(handle_t *handle,
                         new_blocks[i] = ext4_mb_new_blocks(handle, ar, &err);
                 } else
                         ar->goal = new_blocks[i] = ext4_new_meta_blocks(handle,
-                                    ar->inode, ar->goal, 0, NULL, &err);
+                                        ar->inode, ar->goal,
+                                        ar->flags & EXT4_MB_DELALLOC_RESERVED,
+                                        NULL, &err);
                 if (err) {
                         i--;
                         goto failed;
@@ -572,6 +574,8 @@ int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
         ar.logical = map->m_lblk;
         if (S_ISREG(inode->i_mode))
                 ar.flags = EXT4_MB_HINT_DATA;
+        if (flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE)
+                ar.flags |= EXT4_MB_DELALLOC_RESERVED;
 
         ar.goal = ext4_find_goal(inode, map->m_lblk, partial);
 
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 8b0f9ef517d6..15dffdac5907 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4415,9 +4415,12 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
          * EDQUOT check, as blocks and quotas have been already
          * reserved when data being copied into pagecache.
          */
-        if (ext4_test_inode_state(ar->inode, EXT4_STATE_DELALLOC_RESERVED))
+        if (ext4_test_inode_state(ar->inode, EXT4_STATE_DELALLOC_RESERVED)) {
+                WARN_ON((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0);
                 ar->flags |= EXT4_MB_DELALLOC_RESERVED;
-        else {
+        }
+
+        if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0) {
                 /* Without delayed allocation we need to verify
                  * there is enough free blocks to do block allocation
                  * and verify allocation doesn't exceed the quota limits.
@@ -4528,8 +4531,7 @@ out:
         if (inquota && ar->len < inquota)
                 dquot_free_block(ar->inode, EXT4_C2B(sbi, inquota - ar->len));
         if (!ar->len) {
-                if (!ext4_test_inode_state(ar->inode,
-                                           EXT4_STATE_DELALLOC_RESERVED))
+                if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0)
                         /* release all the reserved blocks if non delalloc */
                         percpu_counter_sub(&sbi->s_dirtyclusters_counter,
                                                 reserv_clstrs);
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index e7387337060c..da4df703c211 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -899,14 +899,8 @@ inserted:
                         if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
                                 goal = goal & EXT4_MAX_BLOCK_FILE_PHYS;
 
-                        /*
-                         * take i_data_sem because we will test
-                         * i_delalloc_reserved_flag in ext4_mb_new_blocks
-                         */
-                        down_read(&EXT4_I(inode)->i_data_sem);
                         block = ext4_new_meta_blocks(handle, inode, goal, 0,
                                                      NULL, &error);
-                        up_read((&EXT4_I(inode)->i_data_sem));
                         if (error)
                                 goto cleanup;