| Message ID | 20230424054926.26927-12-hch@lst.de (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [f2fs-dev,01/17] fs: unexport buffer_check_dirty_writeback | expand |
On Mon, Apr 24, 2023 at 07:49:20AM +0200, Christoph Hellwig wrote: > Move the assignment to current->backing_dev_info from the callers into > iomap_file_buffered_write. Note that zonefs was missing this assignment > before. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > fs/gfs2/file.c | 3 --- > fs/iomap/buffered-io.c | 4 ++++ > fs/xfs/xfs_file.c | 5 ----- > 3 files changed, 4 insertions(+), 8 deletions(-) > > diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c > index 8c4fad359ff538..4d88c6080b3e30 100644 > --- a/fs/gfs2/file.c > +++ b/fs/gfs2/file.c > @@ -25,7 +25,6 @@ > #include <linux/dlm.h> > #include <linux/dlm_plock.h> > #include <linux/delay.h> > -#include <linux/backing-dev.h> > #include <linux/fileattr.h> > > #include "gfs2.h" > @@ -1041,11 +1040,9 @@ static ssize_t gfs2_file_buffered_write(struct kiocb *iocb, > goto out_unlock; > } > > - current->backing_dev_info = inode_to_bdi(inode); > pagefault_disable(); > ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops); > pagefault_enable(); > - current->backing_dev_info = NULL; > if (ret > 0) { > iocb->ki_pos += ret; > written += ret; > diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c > index 2986be63d2bea6..3d5042efda202a 100644 > --- a/fs/iomap/buffered-io.c > +++ b/fs/iomap/buffered-io.c > @@ -3,6 +3,7 @@ > * Copyright (C) 2010 Red Hat, Inc. > * Copyright (C) 2016-2019 Christoph Hellwig. > */ > +#include <linux/backing-dev.h> > #include <linux/module.h> > #include <linux/compiler.h> > #include <linux/fs.h> > @@ -876,8 +877,11 @@ iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i, > if (iocb->ki_flags & IOCB_NOWAIT) > iter.flags |= IOMAP_NOWAIT; > > + current->backing_dev_info = inode_to_bdi(iter.inode); Dumb question from me late on a Sunday night, but does the iomap_unshare code need to set this too? Since it works by dirtying pagecache folios without actually changing the contents? --D > while ((ret = iomap_iter(&iter, ops)) > 0) > iter.processed = iomap_write_iter(&iter, i); > + current->backing_dev_info = NULL; > + > if (iter.pos == iocb->ki_pos) > return ret; > return iter.pos - iocb->ki_pos; > diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c > index 705250f9f90a1b..f5442e689baf15 100644 > --- a/fs/xfs/xfs_file.c > +++ b/fs/xfs/xfs_file.c > @@ -27,7 +27,6 @@ > > #include <linux/dax.h> > #include <linux/falloc.h> > -#include <linux/backing-dev.h> > #include <linux/mman.h> > #include <linux/fadvise.h> > #include <linux/mount.h> > @@ -717,9 +716,6 @@ xfs_file_buffered_write( > if (ret) > goto out; > > - /* We can write back this queue in page reclaim */ > - current->backing_dev_info = inode_to_bdi(inode); > - > trace_xfs_file_buffered_write(iocb, from); > ret = iomap_file_buffered_write(iocb, from, > &xfs_buffered_write_iomap_ops); > @@ -753,7 +749,6 @@ xfs_file_buffered_write( > goto write_retry; > } > > - current->backing_dev_info = NULL; > out: > if (iolock) > xfs_iunlock(ip, iolock); > -- > 2.39.2 >
On Sun, Apr 23, 2023 at 11:18:25PM -0700, Darrick J. Wong wrote: > > @@ -876,8 +877,11 @@ iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i, > > if (iocb->ki_flags & IOCB_NOWAIT) > > iter.flags |= IOMAP_NOWAIT; > > > > + current->backing_dev_info = inode_to_bdi(iter.inode); > > Dumb question from me late on a Sunday night, but does the iomap_unshare > code need to set this too? Since it works by dirtying pagecache folios > without actually changing the contents? A very good question that I have no answer for. The current->backing_dev_info mechanism confuses the heck out of me and appears basically undocumented.
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index 8c4fad359ff538..4d88c6080b3e30 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -25,7 +25,6 @@ #include <linux/dlm.h> #include <linux/dlm_plock.h> #include <linux/delay.h> -#include <linux/backing-dev.h> #include <linux/fileattr.h> #include "gfs2.h" @@ -1041,11 +1040,9 @@ static ssize_t gfs2_file_buffered_write(struct kiocb *iocb, goto out_unlock; } - current->backing_dev_info = inode_to_bdi(inode); pagefault_disable(); ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops); pagefault_enable(); - current->backing_dev_info = NULL; if (ret > 0) { iocb->ki_pos += ret; written += ret; diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 2986be63d2bea6..3d5042efda202a 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -3,6 +3,7 @@ * Copyright (C) 2010 Red Hat, Inc. * Copyright (C) 2016-2019 Christoph Hellwig. */ +#include <linux/backing-dev.h> #include <linux/module.h> #include <linux/compiler.h> #include <linux/fs.h> @@ -876,8 +877,11 @@ iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i, if (iocb->ki_flags & IOCB_NOWAIT) iter.flags |= IOMAP_NOWAIT; + current->backing_dev_info = inode_to_bdi(iter.inode); while ((ret = iomap_iter(&iter, ops)) > 0) iter.processed = iomap_write_iter(&iter, i); + current->backing_dev_info = NULL; + if (iter.pos == iocb->ki_pos) return ret; return iter.pos - iocb->ki_pos; diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 705250f9f90a1b..f5442e689baf15 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -27,7 +27,6 @@ #include <linux/dax.h> #include <linux/falloc.h> -#include <linux/backing-dev.h> #include <linux/mman.h> #include <linux/fadvise.h> #include <linux/mount.h> @@ -717,9 +716,6 @@ xfs_file_buffered_write( if (ret) goto out; - /* We can write back this queue in page reclaim */ - current->backing_dev_info = inode_to_bdi(inode); - trace_xfs_file_buffered_write(iocb, from); ret = iomap_file_buffered_write(iocb, from, &xfs_buffered_write_iomap_ops); @@ -753,7 +749,6 @@ xfs_file_buffered_write( goto write_retry; } - current->backing_dev_info = NULL; out: if (iolock) xfs_iunlock(ip, iolock);
Move the assignment to current->backing_dev_info from the callers into iomap_file_buffered_write. Note that zonefs was missing this assignment before. Signed-off-by: Christoph Hellwig <hch@lst.de> --- fs/gfs2/file.c | 3 --- fs/iomap/buffered-io.c | 4 ++++ fs/xfs/xfs_file.c | 5 ----- 3 files changed, 4 insertions(+), 8 deletions(-)