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fs: add IOCB_SYNC and IOCB_DSYNC 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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
View File

@ -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;
}