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authorChristoph Hellwig <hch@lst.de>2019-06-28 19:31:38 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2019-06-30 09:05:17 -0700
commit73d30d48749f883fbaaf68ef5d774e99ffafda5d (patch)
treebb1fc3ef60bb74dac86f8db0c3e3a80d95d56e65 /fs/xfs/xfs_file.c
parentfe64e0d26b1c8096073661851edc99d6370f5e96 (diff)
xfs: remove XFS_TRANS_NOFS
Instead of a magic flag for xfs_trans_alloc, just ensure all callers that can't relclaim through the file system use memalloc_nofs_save to set the per-task nofs flag. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'fs/xfs/xfs_file.c')
-rw-r--r--fs/xfs/xfs_file.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 3041b44e38c6..e93bacbd49ae 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -374,6 +374,7 @@ xfs_dio_write_end_io(
struct inode *inode = file_inode(iocb->ki_filp);
struct xfs_inode *ip = XFS_I(inode);
loff_t offset = iocb->ki_pos;
+ unsigned int nofs_flag;
int error = 0;
trace_xfs_end_io_direct_write(ip, offset, size);
@@ -390,10 +391,17 @@ xfs_dio_write_end_io(
*/
XFS_STATS_ADD(ip->i_mount, xs_write_bytes, size);
+ /*
+ * We can allocate memory here while doing writeback on behalf of
+ * memory reclaim. To avoid memory allocation deadlocks set the
+ * task-wide nofs context for the following operations.
+ */
+ nofs_flag = memalloc_nofs_save();
+
if (flags & IOMAP_DIO_COW) {
error = xfs_reflink_end_cow(ip, offset, size);
if (error)
- return error;
+ goto out;
}
/*
@@ -402,8 +410,10 @@ xfs_dio_write_end_io(
* earlier allows a racing dio read to find unwritten extents before
* they are converted.
*/
- if (flags & IOMAP_DIO_UNWRITTEN)
- return xfs_iomap_write_unwritten(ip, offset, size, true);
+ if (flags & IOMAP_DIO_UNWRITTEN) {
+ error = xfs_iomap_write_unwritten(ip, offset, size, true);
+ goto out;
+ }
/*
* We need to update the in-core inode size here so that we don't end up
@@ -425,6 +435,8 @@ xfs_dio_write_end_io(
spin_unlock(&ip->i_flags_lock);
}
+out:
+ memalloc_nofs_restore(nofs_flag);
return error;
}