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zfs does not honor NFS sync write semantics

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The linux kernel's nfsd implementation use RWF_SYNC to determine if the
write is synchronous or not. This flag is used to set the kernel's I/O
control block flags. Unfortunately, ZFS was not updated to inspect these
flags so NFS sync writes were not being honored.

This change maps the IOCB_* flags to the ZFS equivalent.

Reviewed-by: Don Brady <don.brady@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: George Wilson <george.wilson@delphix.com>
Closes #8474 
Closes #8452 
Closes #8486
This commit is contained in:
George Wilson 2019-03-11 12:13:37 -04:00 committed by Brian Behlendorf
parent 1118f99449
commit b1b94e9644
1 changed files with 30 additions and 2 deletions
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32
module/zfs/zpl_file.c
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@ -216,6 +216,30 @@ zpl_aio_fsync(struct kiocb *kiocb, int datasync)
#error "Unsupported fops->fsync() implementation"
#endif
static inline int
zfs_io_flags(struct kiocb *kiocb)
{
int flags = 0;
#if defined(IOCB_DSYNC)
if (kiocb->ki_flags & IOCB_DSYNC)
flags |= FDSYNC;
#endif
#if defined(IOCB_SYNC)
if (kiocb->ki_flags & IOCB_SYNC)
flags |= FSYNC;
#endif
#if defined(IOCB_APPEND)
if (kiocb->ki_flags & IOCB_APPEND)
flags |= FAPPEND;
#endif
#if defined(IOCB_DIRECT)
if (kiocb->ki_flags & IOCB_DIRECT)
flags |= FDIRECT;
#endif
return (flags);
}
static ssize_t
zpl_read_common_iovec(struct inode *ip, const struct iovec *iovp, size_t count,
unsigned long nr_segs, loff_t *ppos, uio_seg_t segment, int flags,
@ -266,10 +290,12 @@ zpl_iter_read_common(struct kiocb *kiocb, const struct iovec *iovp,
cred_t *cr = CRED();
struct file *filp = kiocb->ki_filp;
ssize_t read;
unsigned int f_flags = filp->f_flags;
f_flags |= zfs_io_flags(kiocb);
crhold(cr);
read = zpl_read_common_iovec(filp->f_mapping->host, iovp, count,
nr_segs, &kiocb->ki_pos, seg, filp->f_flags, cr, skip);
nr_segs, &kiocb->ki_pos, seg, f_flags, cr, skip);
crfree(cr);
file_accessed(filp);
@ -362,10 +388,12 @@ zpl_iter_write_common(struct kiocb *kiocb, const struct iovec *iovp,
cred_t *cr = CRED();
struct file *filp = kiocb->ki_filp;
ssize_t wrote;
unsigned int f_flags = filp->f_flags;
f_flags |= zfs_io_flags(kiocb);
crhold(cr);
wrote = zpl_write_common_iovec(filp->f_mapping->host, iovp, count,
nr_segs, &kiocb->ki_pos, seg, filp->f_flags, cr, skip);
nr_segs, &kiocb->ki_pos, seg, f_flags, cr, skip);
crfree(cr);
return (wrote);