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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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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;
}