btrfs: Remove redundant FLAG_VACANCY

Commit 9036c10208e1 ("Btrfs: update hole handling v2") added the
FLAG_VACANCY to denote holes, however there was already a consistent way
of flagging extents which represent hole - ->block_start =
EXTENT_MAP_HOLE. And also the only place where this flag is checked is
in the fiemap code, but the block_start value is also checked and every
other place in the filesystem detects holes by using block_start
value's. So remove the extra flag. This survived a full xfstest run.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 932d805a81e3e7a586ec550ea2e277e9483949dd..ef72efef8b39c6b166071e5c93ccd62d30323189 100644 (file)
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -4311,10 +4311,8 @@ static struct extent_map *get_extent_skip_holes(struct inode *inode,
                        return em;
 
                /* if this isn't a hole return it */
-               if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) &&
-                   em->block_start != EXTENT_MAP_HOLE) {
+               if (em->block_start != EXTENT_MAP_HOLE)
                        return em;
-               }
 
                /* this is a hole, advance to the next extent */
                offset = extent_map_end(em);

diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 64365bbc9b161b24e5fe3d0817fc65fffb8b04af..e9e285d45c7ec48b66cc43892d563764f3042368 100644 (file)
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -13,7 +13,6 @@
 /* bits for the flags field */
 #define EXTENT_FLAG_PINNED 0 /* this entry not yet on disk, don't free it */
 #define EXTENT_FLAG_COMPRESSED 1
-#define EXTENT_FLAG_VACANCY 2 /* no file extent item found */
 #define EXTENT_FLAG_PREALLOC 3 /* pre-allocated extent */
 #define EXTENT_FLAG_LOGGING 4 /* Logging this extent */
 #define EXTENT_FLAG_FILLING 5 /* Filling in a preallocated extent */

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 1c704eb824873bec372b86b4ed12bcc99e98fb8e..57785eadb95c24658cc9d1faec4207046e597d06 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7118,7 +7118,6 @@ not_found:
        em->len = len;
 not_found_em:
        em->block_start = EXTENT_MAP_HOLE;
-       set_bit(EXTENT_FLAG_VACANCY, &em->flags);
 insert:
        btrfs_release_path(path);
        if (em->start > start || extent_map_end(em) <= start) {

diff --git a/fs/btrfs/tests/inode-tests.c b/fs/btrfs/tests/inode-tests.c
index 4a0a60d3275d563190c66d994c73645c42af9947..13420cd19ef066d0b98a309099a74e09b81e7fcb 100644 (file)
--- a/fs/btrfs/tests/inode-tests.c
+++ b/fs/btrfs/tests/inode-tests.c
@@ -288,10 +288,6 @@ static noinline int test_btrfs_get_extent(u32 sectorsize, u32 nodesize)
                test_msg("Expected a hole, got %llu\n", em->block_start);
                goto out;
        }
-       if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags)) {
-               test_msg("Vacancy flag wasn't set properly\n");
-               goto out;
-       }
        free_extent_map(em);
        btrfs_drop_extent_cache(BTRFS_I(inode), 0, (u64)-1, 0);
 
@@ -1130,7 +1126,6 @@ int btrfs_test_inodes(u32 sectorsize, u32 nodesize)
        int ret;
 
        set_bit(EXTENT_FLAG_COMPRESSED, &compressed_only);
-       set_bit(EXTENT_FLAG_VACANCY, &vacancy_only);
        set_bit(EXTENT_FLAG_PREALLOC, &prealloc_only);
 
        test_msg("Running btrfs_get_extent tests\n");

diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index 4342a329821f4b4911a824b5b8febd6b52aaede9..c3ac5ec865198e0dfbe5da979dbc32ca2c71bfe0 100644 (file)
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -193,7 +193,6 @@ DEFINE_EVENT(btrfs__inode, btrfs_inode_evict,
        __print_flags(flag, "|",                                        \
                { (1 << EXTENT_FLAG_PINNED),            "PINNED"        },\
                { (1 << EXTENT_FLAG_COMPRESSED),        "COMPRESSED"    },\
-               { (1 << EXTENT_FLAG_VACANCY),           "VACANCY"       },\
                { (1 << EXTENT_FLAG_PREALLOC),          "PREALLOC"      },\
                { (1 << EXTENT_FLAG_LOGGING),           "LOGGING"       },\
                { (1 << EXTENT_FLAG_FILLING),           "FILLING"       },\