diff options
| author | Tahsin Erdogan <tahsin@google.com> | 2017-06-22 17:46:48 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2017-06-22 17:46:48 +0200 |
| commit | 7a9ca53aea10ad4677a0f347ad7639c304b80194 (patch) | |
| tree | 8ad3016dbd9f8820b17a7df3d74233cad1bd52e0 /fs/ext4/super.c | |
| parent | ext4: xattr inode deduplication (diff) | |
| download | linux-7a9ca53aea10ad4677a0f347ad7639c304b80194.tar.xz linux-7a9ca53aea10ad4677a0f347ad7639c304b80194.zip | |
quota: add get_inode_usage callback to transfer multi-inode charges
Ext4 ea_inode feature allows storing xattr values in external inodes to
be able to store values that are bigger than a block in size. Ext4 also
has deduplication support for these type of inodes. With deduplication,
the actual storage waste is eliminated but the users of such inodes are
still charged full quota for the inodes as if there was no sharing
happening in the background.
This design requires ext4 to manually charge the users because the
inodes are shared.
An implication of this is that, if someone calls chown on a file that
has such references we need to transfer the quota for the file and xattr
inodes. Current dquot_transfer() function implicitly transfers one inode
charge. With ea_inode feature, we would like to transfer multiple inode
charges.
Add get_inode_usage callback which can interrogate the total number of
inodes that were charged for a given inode.
[ Applied fix from Colin King to make sure the 'ret' variable is
initialized on the successful return path. Detected by
CoverityScan, CID#1446616 ("Uninitialized scalar variable") --tytso]
Signed-off-by: Tahsin Erdogan <tahsin@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext4/super.c')
| -rw-r--r-- | fs/ext4/super.c | 21 |
1 files changed, 11 insertions, 10 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c index d501f8256dc4..5ac76e8d4013 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1263,16 +1263,17 @@ static struct dquot **ext4_get_dquots(struct inode *inode) } static const struct dquot_operations ext4_quota_operations = { - .get_reserved_space = ext4_get_reserved_space, - .write_dquot = ext4_write_dquot, - .acquire_dquot = ext4_acquire_dquot, - .release_dquot = ext4_release_dquot, - .mark_dirty = ext4_mark_dquot_dirty, - .write_info = ext4_write_info, - .alloc_dquot = dquot_alloc, - .destroy_dquot = dquot_destroy, - .get_projid = ext4_get_projid, - .get_next_id = ext4_get_next_id, + .get_reserved_space = ext4_get_reserved_space, + .write_dquot = ext4_write_dquot, + .acquire_dquot = ext4_acquire_dquot, + .release_dquot = ext4_release_dquot, + .mark_dirty = ext4_mark_dquot_dirty, + .write_info = ext4_write_info, + .alloc_dquot = dquot_alloc, + .destroy_dquot = dquot_destroy, + .get_projid = ext4_get_projid, + .get_inode_usage = ext4_get_inode_usage, + .get_next_id = ext4_get_next_id, }; static const struct quotactl_ops ext4_qctl_operations = { |