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author | Theodore Ts'o <tytso@mit.edu> | 2014-09-01 18:39:09 (GMT) |
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committer | Theodore Ts'o <tytso@mit.edu> | 2014-09-01 18:39:09 (GMT) |
commit | b7ea89ad0a6b855172158a999d3f5008403f4011 (patch) | |
tree | f5e4df616627e426bdebef94042c286fbdff0360 | |
parent | 523f431ccfffd3022e80e13befb9594f54b5607e (diff) | |
download | linux-b7ea89ad0a6b855172158a999d3f5008403f4011.tar.xz |
ext4: allow a NULL argument to ext4_ext_drop_refs()
Teach ext4_ext_drop_refs() to accept a NULL argument, much like
kfree(). This allows us to drop a lot of checks to make sure path is
non-NULL before calling ext4_ext_drop_refs().
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
-rw-r--r-- | fs/ext4/extents.c | 48 | ||||
-rw-r--r-- | fs/ext4/extents_status.c | 6 | ||||
-rw-r--r-- | fs/ext4/migrate.c | 6 | ||||
-rw-r--r-- | fs/ext4/move_extent.c | 20 |
4 files changed, 29 insertions, 51 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 4f4d523..538f9a4 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -709,9 +709,11 @@ static void ext4_ext_show_move(struct inode *inode, struct ext4_ext_path *path, void ext4_ext_drop_refs(struct ext4_ext_path *path) { - int depth = path->p_depth; - int i; + int depth, i; + if (!path) + return; + depth = path->p_depth; for (i = 0; i <= depth; i++, path++) if (path->p_bh) { brelse(path->p_bh); @@ -2125,10 +2127,8 @@ merge: err = ext4_ext_dirty(handle, inode, path + path->p_depth); cleanup: - if (npath) { - ext4_ext_drop_refs(npath); - kfree(npath); - } + ext4_ext_drop_refs(npath); + kfree(npath); return err; } @@ -2283,11 +2283,8 @@ static int ext4_fill_fiemap_extents(struct inode *inode, block = es.es_lblk + es.es_len; } - if (path) { - ext4_ext_drop_refs(path); - kfree(path); - } - + ext4_ext_drop_refs(path); + kfree(path); return err; } @@ -3018,11 +3015,9 @@ again: } } out: - if (path) { - ext4_ext_drop_refs(path); - kfree(path); - path = NULL; - } + ext4_ext_drop_refs(path); + kfree(path); + path = NULL; if (err == -EAGAIN) goto again; ext4_journal_stop(handle); @@ -4611,10 +4606,8 @@ out: map->m_pblk = newblock; map->m_len = allocated; out2: - if (path) { - ext4_ext_drop_refs(path); - kfree(path); - } + ext4_ext_drop_refs(path); + kfree(path); trace_ext4_ext_map_blocks_exit(inode, flags, map, err ? err : allocated); @@ -5693,16 +5686,11 @@ ext4_swap_extents(handle_t *handle, struct inode *inode1, count -= len; repeat: - if (path1) { - ext4_ext_drop_refs(path1); - kfree(path1); - path1 = NULL; - } - if (path2) { - ext4_ext_drop_refs(path2); - kfree(path2); - path2 = NULL; - } + ext4_ext_drop_refs(path1); + kfree(path1); + ext4_ext_drop_refs(path2); + kfree(path2); + path1 = path2 = NULL; } return replaced_count; } diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c index 0b7e28e..8ffff96 100644 --- a/fs/ext4/extents_status.c +++ b/fs/ext4/extents_status.c @@ -499,10 +499,8 @@ static void ext4_es_insert_extent_ext_check(struct inode *inode, } } out: - if (path) { - ext4_ext_drop_refs(path); - kfree(path); - } + ext4_ext_drop_refs(path); + kfree(path); } static void ext4_es_insert_extent_ind_check(struct inode *inode, diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c index aff7bdf..061c300 100644 --- a/fs/ext4/migrate.c +++ b/fs/ext4/migrate.c @@ -84,10 +84,8 @@ static int finish_range(handle_t *handle, struct inode *inode, retval = ext4_ext_insert_extent(handle, inode, &path, &newext, 0); err_out: up_write((&EXT4_I(inode)->i_data_sem)); - if (path) { - ext4_ext_drop_refs(path); - kfree(path); - } + ext4_ext_drop_refs(path); + kfree(path); lb->first_pblock = 0; return retval; } diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c index 5e2465a..a34c076 100644 --- a/fs/ext4/move_extent.c +++ b/fs/ext4/move_extent.c @@ -113,10 +113,8 @@ mext_check_coverage(struct inode *inode, ext4_lblk_t from, ext4_lblk_t count, } ret = 1; out: - if (path) { - ext4_ext_drop_refs(path); - kfree(path); - } + ext4_ext_drop_refs(path); + kfree(path); return ret; } @@ -711,11 +709,9 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk, o_start += cur_len; d_start += cur_len; repeat: - if (path) { - ext4_ext_drop_refs(path); - kfree(path); - path = NULL; - } + ext4_ext_drop_refs(path); + kfree(path); + path = NULL; } *moved_len = o_start - orig_blk; if (*moved_len > len) @@ -727,10 +723,8 @@ out: ext4_discard_preallocations(donor_inode); } - if (path) { - ext4_ext_drop_refs(path); - kfree(path); - } + ext4_ext_drop_refs(path); + kfree(path); ext4_double_up_write_data_sem(orig_inode, donor_inode); ext4_inode_resume_unlocked_dio(orig_inode); ext4_inode_resume_unlocked_dio(donor_inode); |