The patch titled
Subject: filemap: add a kiocb_invalidate_post_direct_write helper
has been added to the -mm mm-unstable branch. Its filename is
filemap-add-a-kiocb_invalidate_post_direct_write-helper.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/filemap-add-a-kiocb_invalidate_post_direct_write-helper.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Christoph Hellwig <hch@xxxxxx>
Subject: filemap: add a kiocb_invalidate_post_direct_write helper
Date: Thu, 1 Jun 2023 16:58:58 +0200
Add a helper to invalidate page cache after a dio write.
Link: https://lkml.kernel.org/r/20230601145904.1385409-7-hch@xxxxxx
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
Acked-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
Cc: Anna Schumaker <anna@xxxxxxxxxx>
Cc: Chao Yu <chao@xxxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: Ilya Dryomov <idryomov@xxxxxxxxx>
Cc: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Miklos Szeredi <miklos@xxxxxxxxxx>
Cc: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Cc: Xiubo Li <xiubli@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/direct-io.c | 10 ++--------
fs/iomap/direct-io.c | 12 ++----------
include/linux/fs.h | 5 -----
include/linux/pagemap.h | 1 +
mm/filemap.c | 37 ++++++++++++++++++++-----------------
5 files changed, 25 insertions(+), 40 deletions(-)
--- a/fs/direct-io.c~filemap-add-a-kiocb_invalidate_post_direct_write-helper
+++ a/fs/direct-io.c
@@ -285,14 +285,8 @@ static ssize_t dio_complete(struct dio *
* zeros from unwritten extents.
*/
if (flags & DIO_COMPLETE_INVALIDATE &&
- ret > 0 && dio_op == REQ_OP_WRITE &&
- dio->inode->i_mapping->nrpages) {
- err = invalidate_inode_pages2_range(dio->inode->i_mapping,
- offset >> PAGE_SHIFT,
- (offset + ret - 1) >> PAGE_SHIFT);
- if (err)
- dio_warn_stale_pagecache(dio->iocb->ki_filp);
- }
+ ret > 0 && dio_op == REQ_OP_WRITE)
+ kiocb_invalidate_post_direct_write(dio->iocb, ret);
inode_dio_end(dio->inode);
--- a/fs/iomap/direct-io.c~filemap-add-a-kiocb_invalidate_post_direct_write-helper
+++ a/fs/iomap/direct-io.c
@@ -81,7 +81,6 @@ ssize_t iomap_dio_complete(struct iomap_
{
const struct iomap_dio_ops *dops = dio->dops;
struct kiocb *iocb = dio->iocb;
- struct inode *inode = file_inode(iocb->ki_filp);
loff_t offset = iocb->ki_pos;
ssize_t ret = dio->error;
@@ -108,15 +107,8 @@ ssize_t iomap_dio_complete(struct iomap_
* ->end_io() when necessary, otherwise a racing buffer read would cache
* zeros from unwritten extents.
*/
- if (!dio->error && dio->size &&
- (dio->flags & IOMAP_DIO_WRITE) && inode->i_mapping->nrpages) {
- int err;
- err = invalidate_inode_pages2_range(inode->i_mapping,
- offset >> PAGE_SHIFT,
- (offset + dio->size - 1) >> PAGE_SHIFT);
- if (err)
- dio_warn_stale_pagecache(iocb->ki_filp);
- }
+ if (!dio->error && dio->size && (dio->flags & IOMAP_DIO_WRITE))
+ kiocb_invalidate_post_direct_write(iocb, dio->size);
inode_dio_end(file_inode(iocb->ki_filp));
--- a/include/linux/fs.h~filemap-add-a-kiocb_invalidate_post_direct_write-helper
+++ a/include/linux/fs.h
@@ -2843,11 +2843,6 @@ static inline void inode_dio_end(struct
wake_up_bit(&inode->i_state, __I_DIO_WAKEUP);
}
-/*
- * Warn about a page cache invalidation failure diring a direct I/O write.
- */
-void dio_warn_stale_pagecache(struct file *filp);
-
extern void inode_set_flags(struct inode *inode, unsigned int flags,
unsigned int mask);
--- a/include/linux/pagemap.h~filemap-add-a-kiocb_invalidate_post_direct_write-helper
+++ a/include/linux/pagemap.h
@@ -31,6 +31,7 @@ int invalidate_inode_pages2(struct addre
int invalidate_inode_pages2_range(struct address_space *mapping,
pgoff_t start, pgoff_t end);
int kiocb_invalidate_pages(struct kiocb *iocb, size_t count);
+void kiocb_invalidate_post_direct_write(struct kiocb *iocb, size_t count);
int write_inode_now(struct inode *, int sync);
int filemap_fdatawrite(struct address_space *);
--- a/mm/filemap.c~filemap-add-a-kiocb_invalidate_post_direct_write-helper
+++ a/mm/filemap.c
@@ -3789,7 +3789,7 @@ EXPORT_SYMBOL(read_cache_page_gfp);
/*
* Warn about a page cache invalidation failure during a direct I/O write.
*/
-void dio_warn_stale_pagecache(struct file *filp)
+static void dio_warn_stale_pagecache(struct file *filp)
{
static DEFINE_RATELIMIT_STATE(_rs, 86400 * HZ, DEFAULT_RATELIMIT_BURST);
char pathname[128];
@@ -3806,19 +3806,23 @@ void dio_warn_stale_pagecache(struct fil
}
}
+void kiocb_invalidate_post_direct_write(struct kiocb *iocb, size_t count)
+{
+ struct address_space *mapping = iocb->ki_filp->f_mapping;
+
+ if (mapping->nrpages &&
+ invalidate_inode_pages2_range(mapping,
+ iocb->ki_pos >> PAGE_SHIFT,
+ (iocb->ki_pos + count - 1) >> PAGE_SHIFT))
+ dio_warn_stale_pagecache(iocb->ki_filp);
+}
+
ssize_t
generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
{
- struct file *file = iocb->ki_filp;
- struct address_space *mapping = file->f_mapping;
- struct inode *inode = mapping->host;
- loff_t pos = iocb->ki_pos;
- ssize_t written;
- size_t write_len;
- pgoff_t end;
-
- write_len = iov_iter_count(from);
- end = (pos + write_len - 1) >> PAGE_SHIFT;
+ struct address_space *mapping = iocb->ki_filp->f_mapping;
+ size_t write_len = iov_iter_count(from);
+ ssize_t written;
/*
* If a page can not be invalidated, return 0 to fall back
@@ -3828,7 +3832,7 @@ generic_file_direct_write(struct kiocb *
if (written) {
if (written == -EBUSY)
return 0;
- goto out;
+ return written;
}
written = mapping->a_ops->direct_IO(iocb, from);
@@ -3850,11 +3854,11 @@ generic_file_direct_write(struct kiocb *
*
* Skip invalidation for async writes or if mapping has no pages.
*/
- if (written > 0 && mapping->nrpages &&
- invalidate_inode_pages2_range(mapping, pos >> PAGE_SHIFT, end))
- dio_warn_stale_pagecache(file);
-
if (written > 0) {
+ struct inode *inode = mapping->host;
+ loff_t pos = iocb->ki_pos;
+
+ kiocb_invalidate_post_direct_write(iocb, written);
pos += written;
write_len -= written;
if (pos > i_size_read(inode) && !S_ISBLK(inode->i_mode)) {
@@ -3865,7 +3869,6 @@ generic_file_direct_write(struct kiocb *
}
if (written != -EIOCBQUEUED)
iov_iter_revert(from, write_len - iov_iter_count(from));
-out:
return written;
}
EXPORT_SYMBOL(generic_file_direct_write);
_
Patches currently in -mm which might be from hch@xxxxxx are
backing_dev-remove-current-backing_dev_info.patch
iomap-update-ki_pos-a-little-later-in-iomap_dio_complete.patch
filemap-update-ki_pos-in-generic_perform_write.patch
filemap-add-a-kiocb_write_and_wait-helper.patch
filemap-add-a-kiocb_invalidate_pages-helper.patch
filemap-add-a-kiocb_invalidate_post_direct_write-helper.patch
iomap-update-ki_pos-in-iomap_file_buffered_write.patch
iomap-use-kiocb_write_and_wait-and-kiocb_invalidate_pages.patch
fs-factor-out-a-direct_write_fallback-helper.patch
fuse-update-ki_pos-in-fuse_perform_write.patch
fuse-drop-redundant-arguments-to-fuse_perform_write.patch
fuse-use-direct_write_fallback.patch
squashfs-dont-include-buffer_headh.patch
