| Message ID | 20240827051028.1751933-7-hch@lst.de (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | [01/10] iomap: handle a post-direct I/O invalidate race in iomap_write_delalloc_release | expand |
On Tue, Aug 27, 2024 at 07:09:53AM +0200, Christoph Hellwig wrote: > iomap_file_buffered_write_punch_delalloc can only return errors if either > the ->punch callback returned an error, or if someone changed the API of > mapping_seek_hole_data to return a negative error code that is not > -ENXIO. > > As the only instance of ->punch never returns an error, an such an error > would be fatal anyway remove the entire error propagation and don't > return an error code from iomap_file_buffered_write_punch_delalloc. Not sure I like this one -- if the ->iomap_begin method returns some weird error to iomap_seek_{data,hole}, then I think we'd at least want to complain about that? Though I guess we're punching delalloc mappings for a failed pagecache write, so we've already got ourselves a juicy EIO to throw up to the application so maybe it's fine not to bother with the error recovery erroring out. Right? --D > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > fs/iomap/buffered-io.c | 82 +++++++++++++++--------------------------- > fs/xfs/xfs_iomap.c | 17 ++------- > include/linux/iomap.h | 4 +-- > 3 files changed, 33 insertions(+), 70 deletions(-) > > diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c > index 7950cbecb78c22..3d7e69a542518a 100644 > --- a/fs/iomap/buffered-io.c > +++ b/fs/iomap/buffered-io.c > @@ -1045,7 +1045,7 @@ iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i, > } > EXPORT_SYMBOL_GPL(iomap_file_buffered_write); > > -static int iomap_write_delalloc_ifs_punch(struct inode *inode, > +static void iomap_write_delalloc_ifs_punch(struct inode *inode, > struct folio *folio, loff_t start_byte, loff_t end_byte, > struct iomap *iomap, iomap_punch_t punch) > { > @@ -1053,7 +1053,6 @@ static int iomap_write_delalloc_ifs_punch(struct inode *inode, > loff_t last_byte; > u8 blkbits = inode->i_blkbits; > struct iomap_folio_state *ifs; > - int ret = 0; > > /* > * When we have per-block dirty tracking, there can be > @@ -1063,47 +1062,35 @@ static int iomap_write_delalloc_ifs_punch(struct inode *inode, > */ > ifs = folio->private; > if (!ifs) > - return ret; > + return; > > last_byte = min_t(loff_t, end_byte - 1, > folio_pos(folio) + folio_size(folio) - 1); > first_blk = offset_in_folio(folio, start_byte) >> blkbits; > last_blk = offset_in_folio(folio, last_byte) >> blkbits; > for (i = first_blk; i <= last_blk; i++) { > - if (!ifs_block_is_dirty(folio, ifs, i)) { > - ret = punch(inode, folio_pos(folio) + (i << blkbits), > + if (!ifs_block_is_dirty(folio, ifs, i)) > + punch(inode, folio_pos(folio) + (i << blkbits), > 1 << blkbits, iomap); > - if (ret) > - return ret; > - } > } > - > - return ret; > } > > - > -static int iomap_write_delalloc_punch(struct inode *inode, struct folio *folio, > +static void iomap_write_delalloc_punch(struct inode *inode, struct folio *folio, > loff_t *punch_start_byte, loff_t start_byte, loff_t end_byte, > struct iomap *iomap, iomap_punch_t punch) > { > - int ret = 0; > - > if (!folio_test_dirty(folio)) > - return ret; > + return; > > /* if dirty, punch up to offset */ > if (start_byte > *punch_start_byte) { > - ret = punch(inode, *punch_start_byte, > - start_byte - *punch_start_byte, iomap); > - if (ret) > - return ret; > + punch(inode, *punch_start_byte, start_byte - *punch_start_byte, > + iomap); > } > > /* Punch non-dirty blocks within folio */ > - ret = iomap_write_delalloc_ifs_punch(inode, folio, start_byte, end_byte, > + iomap_write_delalloc_ifs_punch(inode, folio, start_byte, end_byte, > iomap, punch); > - if (ret) > - return ret; > > /* > * Make sure the next punch start is correctly bound to > @@ -1111,8 +1098,6 @@ static int iomap_write_delalloc_punch(struct inode *inode, struct folio *folio, > */ > *punch_start_byte = min_t(loff_t, end_byte, > folio_pos(folio) + folio_size(folio)); > - > - return ret; > } > > /* > @@ -1132,13 +1117,12 @@ static int iomap_write_delalloc_punch(struct inode *inode, struct folio *folio, > * This function uses [start_byte, end_byte) intervals (i.e. open ended) to > * simplify range iterations. > */ > -static int iomap_write_delalloc_scan(struct inode *inode, > +static void iomap_write_delalloc_scan(struct inode *inode, > loff_t *punch_start_byte, loff_t start_byte, loff_t end_byte, > struct iomap *iomap, iomap_punch_t punch) > { > while (start_byte < end_byte) { > struct folio *folio; > - int ret; > > /* grab locked page */ > folio = filemap_lock_folio(inode->i_mapping, > @@ -1149,20 +1133,14 @@ static int iomap_write_delalloc_scan(struct inode *inode, > continue; > } > > - ret = iomap_write_delalloc_punch(inode, folio, punch_start_byte, > + iomap_write_delalloc_punch(inode, folio, punch_start_byte, > start_byte, end_byte, iomap, punch); > - if (ret) { > - folio_unlock(folio); > - folio_put(folio); > - return ret; > - } > > /* move offset to start of next folio in range */ > start_byte = folio_next_index(folio) << PAGE_SHIFT; > folio_unlock(folio); > folio_put(folio); > } > - return 0; > } > > /* > @@ -1198,13 +1176,12 @@ static int iomap_write_delalloc_scan(struct inode *inode, > * require sprinkling this code with magic "+ 1" and "- 1" arithmetic and expose > * the code to subtle off-by-one bugs.... > */ > -static int iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, > +static void iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, > loff_t end_byte, unsigned flags, struct iomap *iomap, > iomap_punch_t punch) > { > loff_t punch_start_byte = start_byte; > loff_t scan_end_byte = min(i_size_read(inode), end_byte); > - int error = 0; > > /* > * Lock the mapping to avoid races with page faults re-instantiating > @@ -1226,13 +1203,15 @@ static int iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, > /* > * If there is no more data to scan, all that is left is to > * punch out the remaining range. > + * > + * Note that mapping_seek_hole_data is only supposed to return > + * either an offset or -ENXIO, so WARN on any other error as > + * that would be an API change without updating the callers. > */ > if (start_byte == -ENXIO || start_byte == scan_end_byte) > break; > - if (start_byte < 0) { > - error = start_byte; > + if (WARN_ON_ONCE(start_byte < 0)) > goto out_unlock; > - } > WARN_ON_ONCE(start_byte < punch_start_byte); > WARN_ON_ONCE(start_byte > scan_end_byte); > > @@ -1242,10 +1221,8 @@ static int iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, > */ > data_end = mapping_seek_hole_data(inode->i_mapping, start_byte, > scan_end_byte, SEEK_HOLE); > - if (data_end < 0) { > - error = data_end; > + if (WARN_ON_ONCE(data_end < 0)) > goto out_unlock; > - } > > /* > * If we race with post-direct I/O invalidation of the page cache, > @@ -1257,22 +1234,19 @@ static int iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, > WARN_ON_ONCE(data_end < start_byte); > WARN_ON_ONCE(data_end > scan_end_byte); > > - error = iomap_write_delalloc_scan(inode, &punch_start_byte, > - start_byte, data_end, iomap, punch); > - if (error) > - goto out_unlock; > + iomap_write_delalloc_scan(inode, &punch_start_byte, start_byte, > + data_end, iomap, punch); > > /* The next data search starts at the end of this one. */ > start_byte = data_end; > } > > if (punch_start_byte < end_byte) > - error = punch(inode, punch_start_byte, > - end_byte - punch_start_byte, iomap); > + punch(inode, punch_start_byte, end_byte - punch_start_byte, > + iomap); > out_unlock: > if (!(flags & IOMAP_ZERO)) > filemap_invalidate_unlock(inode->i_mapping); > - return error; > } > > /* > @@ -1305,7 +1279,7 @@ static int iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, > * ->punch > * internal filesystem allocation lock > */ > -int iomap_file_buffered_write_punch_delalloc(struct inode *inode, > +void iomap_file_buffered_write_punch_delalloc(struct inode *inode, > loff_t pos, loff_t length, ssize_t written, unsigned flags, > struct iomap *iomap, iomap_punch_t punch) > { > @@ -1314,11 +1288,11 @@ int iomap_file_buffered_write_punch_delalloc(struct inode *inode, > unsigned int blocksize = i_blocksize(inode); > > if (iomap->type != IOMAP_DELALLOC) > - return 0; > + return; > > /* If we didn't reserve the blocks, we're not allowed to punch them. */ > if (!(iomap->flags & IOMAP_F_NEW)) > - return 0; > + return; > > /* > * start_byte refers to the first unused block after a short write. If > @@ -1333,10 +1307,10 @@ int iomap_file_buffered_write_punch_delalloc(struct inode *inode, > > /* Nothing to do if we've written the entire delalloc extent */ > if (start_byte >= end_byte) > - return 0; > + return; > > - return iomap_write_delalloc_release(inode, start_byte, end_byte, flags, > - iomap, punch); > + iomap_write_delalloc_release(inode, start_byte, end_byte, flags, iomap, > + punch); > } > EXPORT_SYMBOL_GPL(iomap_file_buffered_write_punch_delalloc); > > diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c > index 695e5bee776f94..1e11f48814c0d0 100644 > --- a/fs/xfs/xfs_iomap.c > +++ b/fs/xfs/xfs_iomap.c > @@ -1208,7 +1208,7 @@ xfs_buffered_write_iomap_begin( > return error; > } > > -static int > +static void > xfs_buffered_write_delalloc_punch( > struct inode *inode, > loff_t offset, > @@ -1216,7 +1216,6 @@ xfs_buffered_write_delalloc_punch( > struct iomap *iomap) > { > xfs_bmap_punch_delalloc_range(XFS_I(inode), offset, offset + length); > - return 0; > } > > static int > @@ -1228,18 +1227,8 @@ xfs_buffered_write_iomap_end( > unsigned flags, > struct iomap *iomap) > { > - > - struct xfs_mount *mp = XFS_M(inode->i_sb); > - int error; > - > - error = iomap_file_buffered_write_punch_delalloc(inode, offset, length, > - written, flags, iomap, > - &xfs_buffered_write_delalloc_punch); > - if (error && !xfs_is_shutdown(mp)) { > - xfs_alert(mp, "%s: unable to clean up ino 0x%llx", > - __func__, XFS_I(inode)->i_ino); > - return error; > - } > + iomap_file_buffered_write_punch_delalloc(inode, offset, length, written, > + flags, iomap, &xfs_buffered_write_delalloc_punch); > return 0; > } > > diff --git a/include/linux/iomap.h b/include/linux/iomap.h > index a931190f6d858b..78a48af4d2c0a1 100644 > --- a/include/linux/iomap.h > +++ b/include/linux/iomap.h > @@ -274,9 +274,9 @@ int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero, > vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf, > const struct iomap_ops *ops); > > -typedef int (*iomap_punch_t)(struct inode *inode, loff_t offset, loff_t length, > +typedef void (*iomap_punch_t)(struct inode *inode, loff_t offset, loff_t length, > struct iomap *iomap); > -int iomap_file_buffered_write_punch_delalloc(struct inode *inode, loff_t pos, > +void iomap_file_buffered_write_punch_delalloc(struct inode *inode, loff_t pos, > loff_t length, ssize_t written, unsigned flag, > struct iomap *iomap, iomap_punch_t punch); > > -- > 2.43.0 > >
On Tue, Aug 27, 2024 at 09:36:13AM -0700, Darrick J. Wong wrote: > > > > As the only instance of ->punch never returns an error, an such an error > > would be fatal anyway remove the entire error propagation and don't > > return an error code from iomap_file_buffered_write_punch_delalloc. > > Not sure I like this one -- if the ->iomap_begin method returns some > weird error to iomap_seek_{data,hole}, then I think we'd at least want > to complain about that? iomap_file_buffered_write_punch_delalloc never calls into iomap_seek_{data,hole} and thus ->iomap_begin. It just uses the lower level mapping_seek_hole_data that checks dirty state, and that always returns either an offset or -ENXIO, which is a special signal and not an error. > Though I guess we're punching delalloc mappings for a failed pagecache > write, so we've already got ourselves a juicy EIO to throw up to the > application so maybe it's fine not to bother with the error recovery > erroring out. Right? But that is true as well.
On Wed, Aug 28, 2024 at 06:52:52AM +0200, Christoph Hellwig wrote: > On Tue, Aug 27, 2024 at 09:36:13AM -0700, Darrick J. Wong wrote: > > > > > > As the only instance of ->punch never returns an error, an such an error > > > would be fatal anyway remove the entire error propagation and don't > > > return an error code from iomap_file_buffered_write_punch_delalloc. > > > > Not sure I like this one -- if the ->iomap_begin method returns some > > weird error to iomap_seek_{data,hole}, then I think we'd at least want > > to complain about that? > > iomap_file_buffered_write_punch_delalloc never calls into > iomap_seek_{data,hole} and thus ->iomap_begin. It just uses the lower > level mapping_seek_hole_data that checks dirty state, and that always > returns either an offset or -ENXIO, which is a special signal and not > an error. > > > Though I guess we're punching delalloc mappings for a failed pagecache > > write, so we've already got ourselves a juicy EIO to throw up to the > > application so maybe it's fine not to bother with the error recovery > > erroring out. Right? > > But that is true as well. Ok, I'm satisfied, Reviewed-by: Darrick J. Wong <djwong@kernel.org> --D
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 7950cbecb78c22..3d7e69a542518a 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -1045,7 +1045,7 @@ iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i, } EXPORT_SYMBOL_GPL(iomap_file_buffered_write); -static int iomap_write_delalloc_ifs_punch(struct inode *inode, +static void iomap_write_delalloc_ifs_punch(struct inode *inode, struct folio *folio, loff_t start_byte, loff_t end_byte, struct iomap *iomap, iomap_punch_t punch) { @@ -1053,7 +1053,6 @@ static int iomap_write_delalloc_ifs_punch(struct inode *inode, loff_t last_byte; u8 blkbits = inode->i_blkbits; struct iomap_folio_state *ifs; - int ret = 0; /* * When we have per-block dirty tracking, there can be @@ -1063,47 +1062,35 @@ static int iomap_write_delalloc_ifs_punch(struct inode *inode, */ ifs = folio->private; if (!ifs) - return ret; + return; last_byte = min_t(loff_t, end_byte - 1, folio_pos(folio) + folio_size(folio) - 1); first_blk = offset_in_folio(folio, start_byte) >> blkbits; last_blk = offset_in_folio(folio, last_byte) >> blkbits; for (i = first_blk; i <= last_blk; i++) { - if (!ifs_block_is_dirty(folio, ifs, i)) { - ret = punch(inode, folio_pos(folio) + (i << blkbits), + if (!ifs_block_is_dirty(folio, ifs, i)) + punch(inode, folio_pos(folio) + (i << blkbits), 1 << blkbits, iomap); - if (ret) - return ret; - } } - - return ret; } - -static int iomap_write_delalloc_punch(struct inode *inode, struct folio *folio, +static void iomap_write_delalloc_punch(struct inode *inode, struct folio *folio, loff_t *punch_start_byte, loff_t start_byte, loff_t end_byte, struct iomap *iomap, iomap_punch_t punch) { - int ret = 0; - if (!folio_test_dirty(folio)) - return ret; + return; /* if dirty, punch up to offset */ if (start_byte > *punch_start_byte) { - ret = punch(inode, *punch_start_byte, - start_byte - *punch_start_byte, iomap); - if (ret) - return ret; + punch(inode, *punch_start_byte, start_byte - *punch_start_byte, + iomap); } /* Punch non-dirty blocks within folio */ - ret = iomap_write_delalloc_ifs_punch(inode, folio, start_byte, end_byte, + iomap_write_delalloc_ifs_punch(inode, folio, start_byte, end_byte, iomap, punch); - if (ret) - return ret; /* * Make sure the next punch start is correctly bound to @@ -1111,8 +1098,6 @@ static int iomap_write_delalloc_punch(struct inode *inode, struct folio *folio, */ *punch_start_byte = min_t(loff_t, end_byte, folio_pos(folio) + folio_size(folio)); - - return ret; } /* @@ -1132,13 +1117,12 @@ static int iomap_write_delalloc_punch(struct inode *inode, struct folio *folio, * This function uses [start_byte, end_byte) intervals (i.e. open ended) to * simplify range iterations. */ -static int iomap_write_delalloc_scan(struct inode *inode, +static void iomap_write_delalloc_scan(struct inode *inode, loff_t *punch_start_byte, loff_t start_byte, loff_t end_byte, struct iomap *iomap, iomap_punch_t punch) { while (start_byte < end_byte) { struct folio *folio; - int ret; /* grab locked page */ folio = filemap_lock_folio(inode->i_mapping, @@ -1149,20 +1133,14 @@ static int iomap_write_delalloc_scan(struct inode *inode, continue; } - ret = iomap_write_delalloc_punch(inode, folio, punch_start_byte, + iomap_write_delalloc_punch(inode, folio, punch_start_byte, start_byte, end_byte, iomap, punch); - if (ret) { - folio_unlock(folio); - folio_put(folio); - return ret; - } /* move offset to start of next folio in range */ start_byte = folio_next_index(folio) << PAGE_SHIFT; folio_unlock(folio); folio_put(folio); } - return 0; } /* @@ -1198,13 +1176,12 @@ static int iomap_write_delalloc_scan(struct inode *inode, * require sprinkling this code with magic "+ 1" and "- 1" arithmetic and expose * the code to subtle off-by-one bugs.... */ -static int iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, +static void iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, loff_t end_byte, unsigned flags, struct iomap *iomap, iomap_punch_t punch) { loff_t punch_start_byte = start_byte; loff_t scan_end_byte = min(i_size_read(inode), end_byte); - int error = 0; /* * Lock the mapping to avoid races with page faults re-instantiating @@ -1226,13 +1203,15 @@ static int iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, /* * If there is no more data to scan, all that is left is to * punch out the remaining range. + * + * Note that mapping_seek_hole_data is only supposed to return + * either an offset or -ENXIO, so WARN on any other error as + * that would be an API change without updating the callers. */ if (start_byte == -ENXIO || start_byte == scan_end_byte) break; - if (start_byte < 0) { - error = start_byte; + if (WARN_ON_ONCE(start_byte < 0)) goto out_unlock; - } WARN_ON_ONCE(start_byte < punch_start_byte); WARN_ON_ONCE(start_byte > scan_end_byte); @@ -1242,10 +1221,8 @@ static int iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, */ data_end = mapping_seek_hole_data(inode->i_mapping, start_byte, scan_end_byte, SEEK_HOLE); - if (data_end < 0) { - error = data_end; + if (WARN_ON_ONCE(data_end < 0)) goto out_unlock; - } /* * If we race with post-direct I/O invalidation of the page cache, @@ -1257,22 +1234,19 @@ static int iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, WARN_ON_ONCE(data_end < start_byte); WARN_ON_ONCE(data_end > scan_end_byte); - error = iomap_write_delalloc_scan(inode, &punch_start_byte, - start_byte, data_end, iomap, punch); - if (error) - goto out_unlock; + iomap_write_delalloc_scan(inode, &punch_start_byte, start_byte, + data_end, iomap, punch); /* The next data search starts at the end of this one. */ start_byte = data_end; } if (punch_start_byte < end_byte) - error = punch(inode, punch_start_byte, - end_byte - punch_start_byte, iomap); + punch(inode, punch_start_byte, end_byte - punch_start_byte, + iomap); out_unlock: if (!(flags & IOMAP_ZERO)) filemap_invalidate_unlock(inode->i_mapping); - return error; } /* @@ -1305,7 +1279,7 @@ static int iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, * ->punch * internal filesystem allocation lock */ -int iomap_file_buffered_write_punch_delalloc(struct inode *inode, +void iomap_file_buffered_write_punch_delalloc(struct inode *inode, loff_t pos, loff_t length, ssize_t written, unsigned flags, struct iomap *iomap, iomap_punch_t punch) { @@ -1314,11 +1288,11 @@ int iomap_file_buffered_write_punch_delalloc(struct inode *inode, unsigned int blocksize = i_blocksize(inode); if (iomap->type != IOMAP_DELALLOC) - return 0; + return; /* If we didn't reserve the blocks, we're not allowed to punch them. */ if (!(iomap->flags & IOMAP_F_NEW)) - return 0; + return; /* * start_byte refers to the first unused block after a short write. If @@ -1333,10 +1307,10 @@ int iomap_file_buffered_write_punch_delalloc(struct inode *inode, /* Nothing to do if we've written the entire delalloc extent */ if (start_byte >= end_byte) - return 0; + return; - return iomap_write_delalloc_release(inode, start_byte, end_byte, flags, - iomap, punch); + iomap_write_delalloc_release(inode, start_byte, end_byte, flags, iomap, + punch); } EXPORT_SYMBOL_GPL(iomap_file_buffered_write_punch_delalloc); diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 695e5bee776f94..1e11f48814c0d0 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -1208,7 +1208,7 @@ xfs_buffered_write_iomap_begin( return error; } -static int +static void xfs_buffered_write_delalloc_punch( struct inode *inode, loff_t offset, @@ -1216,7 +1216,6 @@ xfs_buffered_write_delalloc_punch( struct iomap *iomap) { xfs_bmap_punch_delalloc_range(XFS_I(inode), offset, offset + length); - return 0; } static int @@ -1228,18 +1227,8 @@ xfs_buffered_write_iomap_end( unsigned flags, struct iomap *iomap) { - - struct xfs_mount *mp = XFS_M(inode->i_sb); - int error; - - error = iomap_file_buffered_write_punch_delalloc(inode, offset, length, - written, flags, iomap, - &xfs_buffered_write_delalloc_punch); - if (error && !xfs_is_shutdown(mp)) { - xfs_alert(mp, "%s: unable to clean up ino 0x%llx", - __func__, XFS_I(inode)->i_ino); - return error; - } + iomap_file_buffered_write_punch_delalloc(inode, offset, length, written, + flags, iomap, &xfs_buffered_write_delalloc_punch); return 0; } diff --git a/include/linux/iomap.h b/include/linux/iomap.h index a931190f6d858b..78a48af4d2c0a1 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -274,9 +274,9 @@ int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero, vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops); -typedef int (*iomap_punch_t)(struct inode *inode, loff_t offset, loff_t length, +typedef void (*iomap_punch_t)(struct inode *inode, loff_t offset, loff_t length, struct iomap *iomap); -int iomap_file_buffered_write_punch_delalloc(struct inode *inode, loff_t pos, +void iomap_file_buffered_write_punch_delalloc(struct inode *inode, loff_t pos, loff_t length, ssize_t written, unsigned flag, struct iomap *iomap, iomap_punch_t punch);
iomap_file_buffered_write_punch_delalloc can only return errors if either the ->punch callback returned an error, or if someone changed the API of mapping_seek_hole_data to return a negative error code that is not -ENXIO. As the only instance of ->punch never returns an error, an such an error would be fatal anyway remove the entire error propagation and don't return an error code from iomap_file_buffered_write_punch_delalloc. Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/iomap/buffered-io.c | 82 +++++++++++++++--------------------------- fs/xfs/xfs_iomap.c | 17 ++------- include/linux/iomap.h | 4 +-- 3 files changed, 33 insertions(+), 70 deletions(-)