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xfs: remove wrappers for read/write file operations
Currently the aio_read, aio_write, splice_read and splice_write file operations are divided into a low-level routine doing all the work and one that implements the Linux file operations and does minimal argument wrapping. This is a leftover from the days of the vnode operations layer and can be removed to simplify the code a lot. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig
Alex Elder
parent
dda35b8f84
commit
00258e36b2
@ -96,28 +96,34 @@ xfs_iozero(
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return (-status);
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}
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ssize_t /* bytes read, or (-) error */
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xfs_read(
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xfs_inode_t *ip,
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STATIC ssize_t
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xfs_file_aio_read(
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struct kiocb *iocb,
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const struct iovec *iovp,
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unsigned int segs,
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loff_t *offset,
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int ioflags)
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unsigned long nr_segs,
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loff_t pos)
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{
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struct file *file = iocb->ki_filp;
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struct inode *inode = file->f_mapping->host;
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xfs_mount_t *mp = ip->i_mount;
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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size_t size = 0;
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ssize_t ret = 0;
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int ioflags = 0;
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xfs_fsize_t n;
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unsigned long seg;
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XFS_STATS_INC(xs_read_calls);
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BUG_ON(iocb->ki_pos != pos);
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if (unlikely(file->f_flags & O_DIRECT))
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ioflags |= IO_ISDIRECT;
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if (file->f_mode & FMODE_NOCMTIME)
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ioflags |= IO_INVIS;
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/* START copy & waste from filemap.c */
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for (seg = 0; seg < segs; seg++) {
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for (seg = 0; seg < nr_segs; seg++) {
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const struct iovec *iv = &iovp[seg];
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/*
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@ -134,17 +140,16 @@ xfs_read(
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xfs_buftarg_t *target =
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XFS_IS_REALTIME_INODE(ip) ?
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mp->m_rtdev_targp : mp->m_ddev_targp;
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if ((*offset & target->bt_smask) ||
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if ((iocb->ki_pos & target->bt_smask) ||
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(size & target->bt_smask)) {
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if (*offset == ip->i_size) {
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return (0);
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}
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if (iocb->ki_pos == ip->i_size)
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return 0;
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return -XFS_ERROR(EINVAL);
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}
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}
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n = XFS_MAXIOFFSET(mp) - *offset;
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if ((n <= 0) || (size == 0))
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n = XFS_MAXIOFFSET(mp) - iocb->ki_pos;
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if (n <= 0 || size == 0)
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return 0;
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if (n < size)
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@ -161,7 +166,7 @@ xfs_read(
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int dmflags = FILP_DELAY_FLAG(file) | DM_SEM_FLAG_RD(ioflags);
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int iolock = XFS_IOLOCK_SHARED;
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ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, *offset, size,
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ret = -XFS_SEND_DATA(mp, DM_EVENT_READ, ip, iocb->ki_pos, size,
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dmflags, &iolock);
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if (ret) {
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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@ -172,9 +177,11 @@ xfs_read(
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}
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if (unlikely(ioflags & IO_ISDIRECT)) {
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if (inode->i_mapping->nrpages)
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ret = -xfs_flushinval_pages(ip, (*offset & PAGE_CACHE_MASK),
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-1, FI_REMAPF_LOCKED);
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if (inode->i_mapping->nrpages) {
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ret = -xfs_flushinval_pages(ip,
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(iocb->ki_pos & PAGE_CACHE_MASK),
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-1, FI_REMAPF_LOCKED);
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}
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mutex_unlock(&inode->i_mutex);
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if (ret) {
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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@ -182,10 +189,9 @@ xfs_read(
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}
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}
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trace_xfs_file_read(ip, size, *offset, ioflags);
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trace_xfs_file_read(ip, size, iocb->ki_pos, ioflags);
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iocb->ki_pos = *offset;
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ret = generic_file_aio_read(iocb, iovp, segs, *offset);
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ret = generic_file_aio_read(iocb, iovp, nr_segs, iocb->ki_pos);
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if (ret > 0)
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XFS_STATS_ADD(xs_read_bytes, ret);
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@ -193,20 +199,24 @@ xfs_read(
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return ret;
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}
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ssize_t
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xfs_splice_read(
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xfs_inode_t *ip,
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STATIC ssize_t
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xfs_file_splice_read(
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struct file *infilp,
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loff_t *ppos,
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struct pipe_inode_info *pipe,
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size_t count,
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int flags,
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int ioflags)
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unsigned int flags)
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{
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xfs_mount_t *mp = ip->i_mount;
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struct xfs_inode *ip = XFS_I(infilp->f_mapping->host);
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struct xfs_mount *mp = ip->i_mount;
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int ioflags = 0;
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ssize_t ret;
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XFS_STATS_INC(xs_read_calls);
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if (infilp->f_mode & FMODE_NOCMTIME)
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ioflags |= IO_INVIS;
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if (XFS_FORCED_SHUTDOWN(ip->i_mount))
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return -EIO;
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@ -234,22 +244,26 @@ xfs_splice_read(
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return ret;
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}
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ssize_t
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xfs_splice_write(
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xfs_inode_t *ip,
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STATIC ssize_t
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xfs_file_splice_write(
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struct pipe_inode_info *pipe,
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struct file *outfilp,
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loff_t *ppos,
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size_t count,
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int flags,
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int ioflags)
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unsigned int flags)
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{
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xfs_mount_t *mp = ip->i_mount;
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ssize_t ret;
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struct inode *inode = outfilp->f_mapping->host;
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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xfs_fsize_t isize, new_size;
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int ioflags = 0;
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ssize_t ret;
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XFS_STATS_INC(xs_write_calls);
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if (outfilp->f_mode & FMODE_NOCMTIME)
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ioflags |= IO_INVIS;
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if (XFS_FORCED_SHUTDOWN(ip->i_mount))
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return -EIO;
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@ -484,42 +498,43 @@ out_lock:
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return error;
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}
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ssize_t /* bytes written, or (-) error */
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xfs_write(
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struct xfs_inode *xip,
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STATIC ssize_t
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xfs_file_aio_write(
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struct kiocb *iocb,
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const struct iovec *iovp,
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unsigned int nsegs,
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loff_t *offset,
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int ioflags)
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unsigned long nr_segs,
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loff_t pos)
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{
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struct file *file = iocb->ki_filp;
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struct address_space *mapping = file->f_mapping;
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struct inode *inode = mapping->host;
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unsigned long segs = nsegs;
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xfs_mount_t *mp;
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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ssize_t ret = 0, error = 0;
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int ioflags = 0;
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xfs_fsize_t isize, new_size;
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int iolock;
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int eventsent = 0;
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size_t ocount = 0, count;
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loff_t pos;
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int need_i_mutex;
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XFS_STATS_INC(xs_write_calls);
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error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ);
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BUG_ON(iocb->ki_pos != pos);
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if (unlikely(file->f_flags & O_DIRECT))
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ioflags |= IO_ISDIRECT;
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if (file->f_mode & FMODE_NOCMTIME)
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ioflags |= IO_INVIS;
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error = generic_segment_checks(iovp, &nr_segs, &ocount, VERIFY_READ);
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if (error)
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return error;
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count = ocount;
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pos = *offset;
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if (count == 0)
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return 0;
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mp = xip->i_mount;
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xfs_wait_for_freeze(mp, SB_FREEZE_WRITE);
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if (XFS_FORCED_SHUTDOWN(mp))
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@ -535,30 +550,30 @@ relock:
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mutex_lock(&inode->i_mutex);
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}
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xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
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xfs_ilock(ip, XFS_ILOCK_EXCL|iolock);
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start:
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error = -generic_write_checks(file, &pos, &count,
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S_ISBLK(inode->i_mode));
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if (error) {
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xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
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xfs_iunlock(ip, XFS_ILOCK_EXCL|iolock);
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goto out_unlock_mutex;
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}
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if ((DM_EVENT_ENABLED(xip, DM_EVENT_WRITE) &&
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if ((DM_EVENT_ENABLED(ip, DM_EVENT_WRITE) &&
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!(ioflags & IO_INVIS) && !eventsent)) {
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int dmflags = FILP_DELAY_FLAG(file);
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if (need_i_mutex)
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dmflags |= DM_FLAGS_IMUX;
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xfs_iunlock(xip, XFS_ILOCK_EXCL);
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error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, xip,
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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error = XFS_SEND_DATA(ip->i_mount, DM_EVENT_WRITE, ip,
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pos, count, dmflags, &iolock);
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if (error) {
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goto out_unlock_internal;
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}
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xfs_ilock(xip, XFS_ILOCK_EXCL);
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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eventsent = 1;
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/*
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@ -568,33 +583,33 @@ start:
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* event prevents another call to XFS_SEND_DATA, which is
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* what allows the size to change in the first place.
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*/
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if ((file->f_flags & O_APPEND) && pos != xip->i_size)
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if ((file->f_flags & O_APPEND) && pos != ip->i_size)
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goto start;
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}
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if (ioflags & IO_ISDIRECT) {
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xfs_buftarg_t *target =
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XFS_IS_REALTIME_INODE(xip) ?
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XFS_IS_REALTIME_INODE(ip) ?
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mp->m_rtdev_targp : mp->m_ddev_targp;
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if ((pos & target->bt_smask) || (count & target->bt_smask)) {
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xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
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xfs_iunlock(ip, XFS_ILOCK_EXCL|iolock);
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return XFS_ERROR(-EINVAL);
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}
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if (!need_i_mutex && (mapping->nrpages || pos > xip->i_size)) {
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xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
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if (!need_i_mutex && (mapping->nrpages || pos > ip->i_size)) {
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xfs_iunlock(ip, XFS_ILOCK_EXCL|iolock);
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iolock = XFS_IOLOCK_EXCL;
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need_i_mutex = 1;
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mutex_lock(&inode->i_mutex);
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xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
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xfs_ilock(ip, XFS_ILOCK_EXCL|iolock);
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goto start;
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}
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}
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new_size = pos + count;
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if (new_size > xip->i_size)
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xip->i_new_size = new_size;
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if (new_size > ip->i_size)
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ip->i_new_size = new_size;
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if (likely(!(ioflags & IO_INVIS)))
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file_update_time(file);
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@ -608,14 +623,14 @@ start:
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* to zero it out up to the new size.
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*/
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if (pos > xip->i_size) {
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error = xfs_zero_eof(xip, pos, xip->i_size);
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if (pos > ip->i_size) {
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error = xfs_zero_eof(ip, pos, ip->i_size);
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if (error) {
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xfs_iunlock(xip, XFS_ILOCK_EXCL);
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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goto out_unlock_internal;
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}
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}
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xfs_iunlock(xip, XFS_ILOCK_EXCL);
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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/*
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* If we're writing the file then make sure to clear the
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@ -633,7 +648,7 @@ start:
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if ((ioflags & IO_ISDIRECT)) {
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if (mapping->nrpages) {
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WARN_ON(need_i_mutex == 0);
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error = xfs_flushinval_pages(xip,
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error = xfs_flushinval_pages(ip,
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(pos & PAGE_CACHE_MASK),
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-1, FI_REMAPF_LOCKED);
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if (error)
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@ -642,16 +657,16 @@ start:
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if (need_i_mutex) {
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/* demote the lock now the cached pages are gone */
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xfs_ilock_demote(xip, XFS_IOLOCK_EXCL);
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xfs_ilock_demote(ip, XFS_IOLOCK_EXCL);
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mutex_unlock(&inode->i_mutex);
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iolock = XFS_IOLOCK_SHARED;
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need_i_mutex = 0;
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}
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trace_xfs_file_direct_write(xip, count, *offset, ioflags);
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trace_xfs_file_direct_write(ip, count, iocb->ki_pos, ioflags);
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ret = generic_file_direct_write(iocb, iovp,
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&segs, pos, offset, count, ocount);
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&nr_segs, pos, &iocb->ki_pos, count, ocount);
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/*
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* direct-io write to a hole: fall through to buffered I/O
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@ -664,7 +679,7 @@ start:
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count -= ret;
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ioflags &= ~IO_ISDIRECT;
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xfs_iunlock(xip, iolock);
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xfs_iunlock(ip, iolock);
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goto relock;
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}
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} else {
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@ -672,15 +687,15 @@ start:
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ssize_t ret2 = 0;
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write_retry:
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trace_xfs_file_buffered_write(xip, count, *offset, ioflags);
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ret2 = generic_file_buffered_write(iocb, iovp, segs,
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pos, offset, count, ret);
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trace_xfs_file_buffered_write(ip, count, iocb->ki_pos, ioflags);
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ret2 = generic_file_buffered_write(iocb, iovp, nr_segs,
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pos, &iocb->ki_pos, count, ret);
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/*
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* if we just got an ENOSPC, flush the inode now we
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* aren't holding any page locks and retry *once*
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*/
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if (ret2 == -ENOSPC && !enospc) {
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error = xfs_flush_pages(xip, 0, -1, 0, FI_NONE);
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error = xfs_flush_pages(ip, 0, -1, 0, FI_NONE);
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if (error)
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goto out_unlock_internal;
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enospc = 1;
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@ -692,27 +707,27 @@ write_retry:
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current->backing_dev_info = NULL;
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isize = i_size_read(inode);
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if (unlikely(ret < 0 && ret != -EFAULT && *offset > isize))
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*offset = isize;
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if (unlikely(ret < 0 && ret != -EFAULT && iocb->ki_pos > isize))
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iocb->ki_pos = isize;
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if (*offset > xip->i_size) {
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xfs_ilock(xip, XFS_ILOCK_EXCL);
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if (*offset > xip->i_size)
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xip->i_size = *offset;
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xfs_iunlock(xip, XFS_ILOCK_EXCL);
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if (iocb->ki_pos > ip->i_size) {
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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if (iocb->ki_pos > ip->i_size)
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ip->i_size = iocb->ki_pos;
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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}
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if (ret == -ENOSPC &&
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DM_EVENT_ENABLED(xip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) {
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xfs_iunlock(xip, iolock);
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DM_EVENT_ENABLED(ip, DM_EVENT_NOSPACE) && !(ioflags & IO_INVIS)) {
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xfs_iunlock(ip, iolock);
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if (need_i_mutex)
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mutex_unlock(&inode->i_mutex);
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error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, xip,
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DM_RIGHT_NULL, xip, DM_RIGHT_NULL, NULL, NULL,
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error = XFS_SEND_NAMESP(ip->i_mount, DM_EVENT_NOSPACE, ip,
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DM_RIGHT_NULL, ip, DM_RIGHT_NULL, NULL, NULL,
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0, 0, 0); /* Delay flag intentionally unused */
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if (need_i_mutex)
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mutex_lock(&inode->i_mutex);
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xfs_ilock(xip, iolock);
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xfs_ilock(ip, iolock);
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if (error)
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goto out_unlock_internal;
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goto start;
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@ -729,7 +744,7 @@ write_retry:
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loff_t end = pos + ret - 1;
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int error2;
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|
||||
xfs_iunlock(xip, iolock);
|
||||
xfs_iunlock(ip, iolock);
|
||||
if (need_i_mutex)
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
|
||||
@ -738,17 +753,17 @@ write_retry:
|
||||
error = error2;
|
||||
if (need_i_mutex)
|
||||
mutex_lock(&inode->i_mutex);
|
||||
xfs_ilock(xip, iolock);
|
||||
xfs_ilock(ip, iolock);
|
||||
|
||||
error2 = xfs_fsync(xip);
|
||||
error2 = xfs_fsync(ip);
|
||||
if (!error)
|
||||
error = error2;
|
||||
}
|
||||
|
||||
out_unlock_internal:
|
||||
if (xip->i_new_size) {
|
||||
xfs_ilock(xip, XFS_ILOCK_EXCL);
|
||||
xip->i_new_size = 0;
|
||||
if (ip->i_new_size) {
|
||||
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
||||
ip->i_new_size = 0;
|
||||
/*
|
||||
* If this was a direct or synchronous I/O that failed (such
|
||||
* as ENOSPC) then part of the I/O may have been written to
|
||||
@ -756,89 +771,17 @@ write_retry:
|
||||
* file size may have been adjusted beyond the in-memory file
|
||||
* size and now needs to be truncated back.
|
||||
*/
|
||||
if (xip->i_d.di_size > xip->i_size)
|
||||
xip->i_d.di_size = xip->i_size;
|
||||
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
||||
if (ip->i_d.di_size > ip->i_size)
|
||||
ip->i_d.di_size = ip->i_size;
|
||||
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
||||
}
|
||||
xfs_iunlock(xip, iolock);
|
||||
xfs_iunlock(ip, iolock);
|
||||
out_unlock_mutex:
|
||||
if (need_i_mutex)
|
||||
mutex_unlock(&inode->i_mutex);
|
||||
return -error;
|
||||
}
|
||||
|
||||
STATIC ssize_t
|
||||
xfs_file_aio_read(
|
||||
struct kiocb *iocb,
|
||||
const struct iovec *iov,
|
||||
unsigned long nr_segs,
|
||||
loff_t pos)
|
||||
{
|
||||
struct file *file = iocb->ki_filp;
|
||||
int ioflags = 0;
|
||||
|
||||
BUG_ON(iocb->ki_pos != pos);
|
||||
if (unlikely(file->f_flags & O_DIRECT))
|
||||
ioflags |= IO_ISDIRECT;
|
||||
if (file->f_mode & FMODE_NOCMTIME)
|
||||
ioflags |= IO_INVIS;
|
||||
return xfs_read(XFS_I(file->f_path.dentry->d_inode), iocb, iov,
|
||||
nr_segs, &iocb->ki_pos, ioflags);
|
||||
}
|
||||
|
||||
STATIC ssize_t
|
||||
xfs_file_aio_write(
|
||||
struct kiocb *iocb,
|
||||
const struct iovec *iov,
|
||||
unsigned long nr_segs,
|
||||
loff_t pos)
|
||||
{
|
||||
struct file *file = iocb->ki_filp;
|
||||
int ioflags = 0;
|
||||
|
||||
BUG_ON(iocb->ki_pos != pos);
|
||||
if (unlikely(file->f_flags & O_DIRECT))
|
||||
ioflags |= IO_ISDIRECT;
|
||||
if (file->f_mode & FMODE_NOCMTIME)
|
||||
ioflags |= IO_INVIS;
|
||||
return xfs_write(XFS_I(file->f_mapping->host), iocb, iov, nr_segs,
|
||||
&iocb->ki_pos, ioflags);
|
||||
}
|
||||
|
||||
STATIC ssize_t
|
||||
xfs_file_splice_read(
|
||||
struct file *infilp,
|
||||
loff_t *ppos,
|
||||
struct pipe_inode_info *pipe,
|
||||
size_t len,
|
||||
unsigned int flags)
|
||||
{
|
||||
int ioflags = 0;
|
||||
|
||||
if (infilp->f_mode & FMODE_NOCMTIME)
|
||||
ioflags |= IO_INVIS;
|
||||
|
||||
return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
|
||||
infilp, ppos, pipe, len, flags, ioflags);
|
||||
}
|
||||
|
||||
STATIC ssize_t
|
||||
xfs_file_splice_write(
|
||||
struct pipe_inode_info *pipe,
|
||||
struct file *outfilp,
|
||||
loff_t *ppos,
|
||||
size_t len,
|
||||
unsigned int flags)
|
||||
{
|
||||
int ioflags = 0;
|
||||
|
||||
if (outfilp->f_mode & FMODE_NOCMTIME)
|
||||
ioflags |= IO_INVIS;
|
||||
|
||||
return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
|
||||
pipe, outfilp, ppos, len, flags, ioflags);
|
||||
}
|
||||
|
||||
STATIC int
|
||||
xfs_file_open(
|
||||
struct inode *inode,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user