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New for 5.3:

Browse Source 
- Only mark inode dirty at the end of writing to a file (instead of once
   for every page written).
 - Fix for an accounting error in the page_done callback.
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Merge tag 'iomap-5.3-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull iomap updates from Darrick Wong:
 "There are a few fixes for gfs2 but otherwise it's pretty quiet so far.

   - Only mark inode dirty at the end of writing to a file (instead of
     once for every page written).

   - Fix for an accounting error in the page_done callback"

* tag 'iomap-5.3-merge-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  iomap: fix page_done callback for short writes
  fs: fold __generic_write_end back into generic_write_end
  iomap: don't mark the inode dirty in iomap_write_end
This commit is contained in:
Linus Torvalds 2019-07-10 20:29:45 -07:00
commit a47f5c56b2
5 changed files with 47 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
fs/buffer.c
View File

@ -2086,38 +2086,6 @@ int block_write_begin(struct address_space *mapping, loff_t pos, unsigned len,
}
EXPORT_SYMBOL(block_write_begin);
void __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
struct page *page)
{
loff_t old_size = inode->i_size;
bool i_size_changed = false;
/*
* No need to use i_size_read() here, the i_size cannot change under us
* because we hold i_rwsem.
*
* But it's important to update i_size while still holding page lock:
* page writeout could otherwise come in and zero beyond i_size.
*/
if (pos + copied > inode->i_size) {
i_size_write(inode, pos + copied);
i_size_changed = true;
}
unlock_page(page);
if (old_size < pos)
pagecache_isize_extended(inode, old_size, pos);
/*
* Don't mark the inode dirty under page lock. First, it unnecessarily
* makes the holding time of page lock longer. Second, it forces lock
* ordering of page lock and transaction start for journaling
* filesystems.
*/
if (i_size_changed)
mark_inode_dirty(inode);
}
int block_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
@ -2158,9 +2126,37 @@ int generic_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
{
struct inode *inode = mapping->host;
loff_t old_size = inode->i_size;
bool i_size_changed = false;
copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
__generic_write_end(mapping->host, pos, copied, page);
/*
* No need to use i_size_read() here, the i_size cannot change under us
* because we hold i_rwsem.
*
* But it's important to update i_size while still holding page lock:
* page writeout could otherwise come in and zero beyond i_size.
*/
if (pos + copied > inode->i_size) {
i_size_write(inode, pos + copied);
i_size_changed = true;
}
unlock_page(page);
put_page(page);
if (old_size < pos)
pagecache_isize_extended(inode, old_size, pos);
/*
* Don't mark the inode dirty under page lock. First, it unnecessarily
* makes the holding time of page lock longer. Second, it forces lock
* ordering of page lock and transaction start for journaling
* filesystems.
*/
if (i_size_changed)
mark_inode_dirty(inode);
return copied;
}
EXPORT_SYMBOL(generic_write_end);

2
fs/gfs2/bmap.c
View File

@ -1182,6 +1182,8 @@ static int gfs2_iomap_end(struct inode *inode, loff_t pos, loff_t length,
if (ip->i_qadata && ip->i_qadata->qa_qd_num)
gfs2_quota_unlock(ip);
if (iomap->flags & IOMAP_F_SIZE_CHANGED)
mark_inode_dirty(inode);
gfs2_write_unlock(inode);
out:

2
fs/internal.h
View File

@ -40,8 +40,6 @@ static inline int __sync_blockdev(struct block_device *bdev, int wait)
extern void guard_bio_eod(int rw, struct bio *bio);
extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
get_block_t *get_block, struct iomap *iomap);
void __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
struct page *page);
/*
* char_dev.c

17
fs/iomap.c
View File

@ -777,6 +777,7 @@ iomap_write_end(struct inode *inode, loff_t pos, unsigned len,
unsigned copied, struct page *page, struct iomap *iomap)
{
const struct iomap_page_ops *page_ops = iomap->page_ops;
loff_t old_size = inode->i_size;
int ret;
if (iomap->type == IOMAP_INLINE) {
@ -788,9 +789,21 @@ iomap_write_end(struct inode *inode, loff_t pos, unsigned len,
ret = __iomap_write_end(inode, pos, len, copied, page, iomap);
}
__generic_write_end(inode, pos, ret, page);
/*
* Update the in-memory inode size after copying the data into the page
* cache. It's up to the file system to write the updated size to disk,
* preferably after I/O completion so that no stale data is exposed.
*/
if (pos + ret > old_size) {
i_size_write(inode, pos + ret);
iomap->flags |= IOMAP_F_SIZE_CHANGED;
}
unlock_page(page);
if (old_size < pos)
pagecache_isize_extended(inode, old_size, pos);
if (page_ops && page_ops->page_done)
page_ops->page_done(inode, pos, copied, page, iomap);
page_ops->page_done(inode, pos, ret, page, iomap);
put_page(page);
if (ret < len)

1
include/linux/iomap.h
View File

@ -35,6 +35,7 @@ struct vm_fault;
#define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */
#define IOMAP_F_DIRTY 0x02 /* uncommitted metadata */
#define IOMAP_F_BUFFER_HEAD 0x04 /* file system requires buffer heads */
#define IOMAP_F_SIZE_CHANGED 0x08 /* file size has changed */
/*
* Flags that only need to be reported for IOMAP_REPORT requests: