diff options
author | Christoph Hellwig <hch@lst.de> | 2019-06-28 19:31:38 -0700 |
---|---|---|
committer | Darrick J. Wong <darrick.wong@oracle.com> | 2019-06-30 09:05:17 -0700 |
commit | 73d30d48749f883fbaaf68ef5d774e99ffafda5d (patch) | |
tree | bb1fc3ef60bb74dac86f8db0c3e3a80d95d56e65 /fs/xfs | |
parent | fe64e0d26b1c8096073661851edc99d6370f5e96 (diff) | |
download | linux-73d30d48749f883fbaaf68ef5d774e99ffafda5d.tar.bz2 |
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')
-rw-r--r-- | fs/xfs/libxfs/xfs_shared.h | 1 | ||||
-rw-r--r-- | fs/xfs/xfs_aops.c | 35 | ||||
-rw-r--r-- | fs/xfs/xfs_file.c | 18 | ||||
-rw-r--r-- | fs/xfs/xfs_iomap.c | 2 | ||||
-rw-r--r-- | fs/xfs/xfs_reflink.c | 4 | ||||
-rw-r--r-- | fs/xfs/xfs_trans.c | 4 |
6 files changed, 41 insertions, 23 deletions
diff --git a/fs/xfs/libxfs/xfs_shared.h b/fs/xfs/libxfs/xfs_shared.h index b9094709bc79..c45acbd3add9 100644 --- a/fs/xfs/libxfs/xfs_shared.h +++ b/fs/xfs/libxfs/xfs_shared.h @@ -65,7 +65,6 @@ void xfs_log_get_max_trans_res(struct xfs_mount *mp, #define XFS_TRANS_DQ_DIRTY 0x10 /* at least one dquot in trx dirty */ #define XFS_TRANS_RESERVE 0x20 /* OK to use reserved data blocks */ #define XFS_TRANS_NO_WRITECOUNT 0x40 /* do not elevate SB writecount */ -#define XFS_TRANS_NOFS 0x80 /* pass KM_NOFS to kmem_alloc */ /* * LOWMODE is used by the allocator to activate the lowspace algorithm - when * free space is running low the extent allocator may choose to allocate an diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 326294a4918f..137b3a273f3d 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -133,8 +133,7 @@ xfs_setfilesize_trans_alloc( struct xfs_trans *tp; int error; - error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, - XFS_TRANS_NOFS, &tp); + error = xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp); if (error) return error; @@ -235,9 +234,17 @@ xfs_end_ioend( struct xfs_inode *ip = XFS_I(ioend->io_inode); xfs_off_t offset = ioend->io_offset; size_t size = ioend->io_size; + unsigned int nofs_flag; int error; /* + * 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(); + + /* * Just clean up the in-memory strutures if the fs has been shut down. */ if (XFS_FORCED_SHUTDOWN(ip->i_mount)) { @@ -277,6 +284,8 @@ done: list_del_init(&ioend->io_list); xfs_destroy_ioend(ioend, error); } + + memalloc_nofs_restore(nofs_flag); } /* @@ -637,21 +646,19 @@ xfs_submit_ioend( struct xfs_ioend *ioend, int status) { + unsigned int nofs_flag; + + /* + * 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(); + /* Convert CoW extents to regular */ if (!status && ioend->io_fork == XFS_COW_FORK) { - /* - * Yuk. This can do memory allocation, but is not a - * transactional operation so everything is done in GFP_KERNEL - * context. That can deadlock, because we hold pages in - * writeback state and GFP_KERNEL allocations can block on them. - * Hence we must operate in nofs conditions here. - */ - unsigned nofs_flag; - - nofs_flag = memalloc_nofs_save(); status = xfs_reflink_convert_cow(XFS_I(ioend->io_inode), ioend->io_offset, ioend->io_size); - memalloc_nofs_restore(nofs_flag); } /* Reserve log space if we might write beyond the on-disk inode size. */ @@ -662,6 +669,8 @@ xfs_submit_ioend( !ioend->io_append_trans) status = xfs_setfilesize_trans_alloc(ioend); + memalloc_nofs_restore(nofs_flag); + ioend->io_bio->bi_private = ioend; ioend->io_bio->bi_end_io = xfs_end_bio; 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; } diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index b1ef32822bb9..3a4310d7cb59 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -776,7 +776,7 @@ xfs_iomap_write_unwritten( * complete here and might deadlock on the iolock. */ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, - XFS_TRANS_RESERVE | XFS_TRANS_NOFS, &tp); + XFS_TRANS_RESERVE, &tp); if (error) return error; diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index da0ef8483c13..c4ec7afd1170 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -561,7 +561,7 @@ xfs_reflink_cancel_cow_range( /* Start a rolling transaction to remove the mappings */ error = xfs_trans_alloc(ip->i_mount, &M_RES(ip->i_mount)->tr_write, - 0, 0, XFS_TRANS_NOFS, &tp); + 0, 0, 0, &tp); if (error) goto out; @@ -620,7 +620,7 @@ xfs_reflink_end_cow_extent( resblks = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, - XFS_TRANS_RESERVE | XFS_TRANS_NOFS, &tp); + XFS_TRANS_RESERVE, &tp); if (error) return error; diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c index 5b31e0b400f4..d42a68d8313b 100644 --- a/fs/xfs/xfs_trans.c +++ b/fs/xfs/xfs_trans.c @@ -263,9 +263,7 @@ xfs_trans_alloc( * GFP_NOFS allocation context so that we avoid lockdep false positives * by doing GFP_KERNEL allocations inside sb_start_intwrite(). */ - tp = kmem_zone_zalloc(xfs_trans_zone, - (flags & XFS_TRANS_NOFS) ? KM_NOFS : KM_SLEEP); - + tp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP); if (!(flags & XFS_TRANS_NO_WRITECOUNT)) sb_start_intwrite(mp->m_super); |