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fs: add IOCB_SYNC and IOCB_DSYNC

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This will allow us to do per-I/O sync file writes, as required by a lot
of fileservers or storage targets.

XXX: Will need a few additional audits for O_DSYNC

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2016-04-07 08:52:00 -07:00 committed by Al Viro
parent 716b9bc0cb
commit dde0c2e798
13 changed files with 25 additions and 16 deletions
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2
fs/block_dev.c
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@ -1662,7 +1662,7 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
ret = __generic_file_write_iter(iocb, from);
if (ret > 0) {
ssize_t err;
err = generic_write_sync(file, iocb->ki_pos - ret, ret);
err = generic_write_sync(iocb, iocb->ki_pos - ret, ret);
if (err < 0)
ret = err;
}

2
fs/btrfs/file.c
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@ -1852,7 +1852,7 @@ static ssize_t btrfs_file_write_iter(struct kiocb *iocb,
BTRFS_I(inode)->last_sub_trans = root->log_transid;
spin_unlock(&BTRFS_I(inode)->lock);
if (num_written > 0) {
err = generic_write_sync(file, pos, num_written);
err = generic_write_sync(iocb, pos, num_written);
if (err < 0)
num_written = err;
}

2
fs/cifs/file.c
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@ -2688,7 +2688,7 @@ out:
inode_unlock(inode);
if (rc > 0) {
ssize_t err = generic_write_sync(file, iocb->ki_pos - rc, rc);
ssize_t err = generic_write_sync(iocb, iocb->ki_pos - rc, rc);
if (err < 0)
rc = err;
}

2
fs/direct-io.c
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@ -268,7 +268,7 @@ static ssize_t dio_complete(struct dio *dio, ssize_t ret, bool is_async)
if (dio->rw & WRITE) {
int err;
err = generic_write_sync(dio->iocb->ki_filp, offset,
err = generic_write_sync(dio->iocb, offset,
transferred);
if (err < 0 && ret > 0)
ret = err;

2
fs/ext4/file.c
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@ -172,7 +172,7 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (ret > 0) {
ssize_t err;
err = generic_write_sync(file, iocb->ki_pos - ret, ret);
err = generic_write_sync(iocb, iocb->ki_pos - ret, ret);
if (err < 0)
ret = err;
}

2
fs/f2fs/file.c
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@ -1885,7 +1885,7 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (ret > 0) {
ssize_t err;
err = generic_write_sync(file, iocb->ki_pos - ret, ret);
err = generic_write_sync(iocb, iocb->ki_pos - ret, ret);
if (err < 0)
ret = err;
}

5
fs/gfs2/file.c
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@ -895,7 +895,10 @@ static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t
mark_inode_dirty(inode);
}
return generic_write_sync(file, pos, count);
if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
return vfs_fsync_range(file, pos, pos + count - 1,
(file->f_flags & __O_SYNC) ? 0 : 1);
return 0;
out_trans_fail:
gfs2_inplace_release(ip);

2
fs/nfs/direct.c
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@ -1054,7 +1054,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter)
if (i_size_read(inode) < iocb->ki_pos)
i_size_write(inode, iocb->ki_pos);
spin_unlock(&inode->i_lock);
generic_write_sync(file, pos, result);
generic_write_sync(iocb, pos, result);
}
}
nfs_direct_req_release(dreq);

2
fs/ntfs/file.c
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@ -1953,7 +1953,7 @@ static ssize_t ntfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
current->backing_dev_info = NULL;
inode_unlock(vi);
if (likely(written > 0)) {
err = generic_write_sync(file, iocb->ki_pos, written);
err = generic_write_sync(iocb, iocb->ki_pos, written);
if (err < 0)
written = 0;
}

2
fs/udf/file.c
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@ -152,7 +152,7 @@ out:
if (retval > 0) {
mark_inode_dirty(inode);
err = generic_write_sync(file, iocb->ki_pos - retval, retval);
err = generic_write_sync(iocb, iocb->ki_pos - retval, retval);
if (err < 0)
retval = err;
}

2
fs/xfs/xfs_file.c
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@ -908,7 +908,7 @@ xfs_file_write_iter(
XFS_STATS_ADD(ip->i_mount, xs_write_bytes, ret);
/* Handle various SYNC-type writes */
err = generic_write_sync(file, iocb->ki_pos - ret, ret);
err = generic_write_sync(iocb, iocb->ki_pos - ret, ret);
if (err < 0)
ret = err;
}

14
include/linux/fs.h
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@ -323,6 +323,8 @@ struct writeback_control;
#define IOCB_APPEND (1 << 1)
#define IOCB_DIRECT (1 << 2)
#define IOCB_HIPRI (1 << 3)
#define IOCB_DSYNC (1 << 4)
#define IOCB_SYNC (1 << 5)
struct kiocb {
struct file *ki_filp;
@ -2485,12 +2487,12 @@ extern int filemap_fdatawrite_range(struct address_space *mapping,
extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
int datasync);
extern int vfs_fsync(struct file *file, int datasync);
static inline int generic_write_sync(struct file *file, loff_t pos, loff_t count)
static inline int generic_write_sync(struct kiocb *iocb, loff_t pos, loff_t count)
{
if (!(file->f_flags & O_DSYNC) && !IS_SYNC(file->f_mapping->host))
if (!(iocb->ki_flags & IOCB_DSYNC))
return 0;
return vfs_fsync_range(file, pos, pos + count - 1,
(file->f_flags & __O_SYNC) ? 0 : 1);
return vfs_fsync_range(iocb->ki_filp, pos, pos + count - 1,
(iocb->ki_flags & IOCB_SYNC) ? 0 : 1);
}
extern void emergency_sync(void);
extern void emergency_remount(void);
@ -2942,6 +2944,10 @@ static inline int iocb_flags(struct file *file)
res |= IOCB_APPEND;
if (io_is_direct(file))
res |= IOCB_DIRECT;
if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
res |= IOCB_DSYNC;
if (file->f_flags & __O_SYNC)
res |= IOCB_SYNC;
return res;
}

2
mm/filemap.c
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@ -2794,7 +2794,7 @@ ssize_t generic_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (ret > 0) {
ssize_t err;
err = generic_write_sync(file, iocb->ki_pos - ret, ret);
err = generic_write_sync(iocb, iocb->ki_pos - ret, ret);
if (err < 0)
ret = err;
}