summaryrefslogtreecommitdiffstats
path: root/fs/xfs/xfs_file.c
diff options
context:
space:
mode:
authorNamjae Jeon <namjae.jeon@samsung.com>2014-02-24 10:58:19 +1100
committerDave Chinner <david@fromorbit.com>2014-02-24 10:58:19 +1100
commite1d8fb88a64c1f8094b9f6c3b6d2d9e6719c970d (patch)
treeec95b7acd9f3182e683ea16fab40092d9f038ec6 /fs/xfs/xfs_file.c
parent00f5e61998dd17f5375d9dfc01331f104b83f841 (diff)
downloadop-kernel-dev-e1d8fb88a64c1f8094b9f6c3b6d2d9e6719c970d.zip
op-kernel-dev-e1d8fb88a64c1f8094b9f6c3b6d2d9e6719c970d.tar.gz
xfs: Add support FALLOC_FL_COLLAPSE_RANGE for fallocate
This patch implements fallocate's FALLOC_FL_COLLAPSE_RANGE for XFS. The semantics of this flag are following: 1) It collapses the range lying between offset and length by removing any data blocks which are present in this range and than updates all the logical offsets of extents beyond "offset + len" to nullify the hole created by removing blocks. In short, it does not leave a hole. 2) It should be used exclusively. No other fallocate flag in combination. 3) Offset and length supplied to fallocate should be fs block size aligned in case of xfs and ext4. 4) Collaspe range does not work beyond i_size. Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com> Signed-off-by: Ashish Sangwan <a.sangwan@samsung.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_file.c')
-rw-r--r--fs/xfs/xfs_file.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 2e7989e..52f96e1 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -823,7 +823,8 @@ xfs_file_fallocate(
if (!S_ISREG(inode->i_mode))
return -EINVAL;
- if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
+ if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |
+ FALLOC_FL_COLLAPSE_RANGE))
return -EOPNOTSUPP;
xfs_ilock(ip, XFS_IOLOCK_EXCL);
@@ -831,6 +832,20 @@ xfs_file_fallocate(
error = xfs_free_file_space(ip, offset, len);
if (error)
goto out_unlock;
+ } else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
+ unsigned blksize_mask = (1 << inode->i_blkbits) - 1;
+
+ if (offset & blksize_mask || len & blksize_mask) {
+ error = -EINVAL;
+ goto out_unlock;
+ }
+
+ ASSERT(offset + len < i_size_read(inode));
+ new_size = i_size_read(inode) - len;
+
+ error = xfs_collapse_file_space(ip, offset, len);
+ if (error)
+ goto out_unlock;
} else {
if (!(mode & FALLOC_FL_KEEP_SIZE) &&
offset + len > i_size_read(inode)) {
@@ -859,7 +874,7 @@ xfs_file_fallocate(
if (ip->i_d.di_mode & S_IXGRP)
ip->i_d.di_mode &= ~S_ISGID;
- if (!(mode & FALLOC_FL_PUNCH_HOLE))
+ if (!(mode & (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_COLLAPSE_RANGE)))
ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
OpenPOWER on IntegriCloud