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| author | Theodore Ts'o <tytso@mit.edu> | 2019-08-11 16:32:41 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2019-08-11 16:32:41 -0400 |
| commit | bb5835edcdf8bf78bbe51cff13e332c439bc0567 (patch) | |
| tree | 74e9498c0cb0f42a3158d0a892181316e5a8a243 /fs/ext4/extents_status.c | |
| parent | 1ad3ea6e0a694b0486eb2cbe60378ad0fbf23642 (diff) | |
| download | linux-bb5835edcdf8bf78bbe51cff13e332c439bc0567.tar.gz | |
ext4: add new ioctl EXT4_IOC_GET_ES_CACHE
For debugging reasons, it's useful to know the contents of the extent
cache. Since the extent cache contains much of what is in the fiemap
ioctl, use an fiemap-style interface to return this information.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/extents_status.c')
| -rw-r--r-- | fs/ext4/extents_status.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c index 02cc8eb3eb0e1..a959adc59bcdc 100644 --- a/fs/ext4/extents_status.c +++ b/fs/ext4/extents_status.c @@ -899,6 +899,7 @@ void ext4_es_cache_extent(struct inode *inode, ext4_lblk_t lblk, * Return: 1 on found, 0 on not */ int ext4_es_lookup_extent(struct inode *inode, ext4_lblk_t lblk, + ext4_lblk_t *next_lblk, struct extent_status *es) { struct ext4_es_tree *tree; @@ -948,6 +949,15 @@ out: if (!ext4_es_is_referenced(es1)) ext4_es_set_referenced(es1); stats->es_stats_cache_hits++; + if (next_lblk) { + node = rb_next(&es1->rb_node); + if (node) { + es1 = rb_entry(node, struct extent_status, + rb_node); + *next_lblk = es1->es_lblk; + } else + *next_lblk = 0; + } } else { stats->es_stats_cache_misses++; } |