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ocfs2: Add splice support
Add splice read/write support in ocfs2. ocfs2_file_splice_read/write are very similar to ocfs2_file_aio_read/write. Signed-off-by: Tiger Yang <tiger.yang@oracle.com> Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Tiger Yang
Mark Fasheh
parent
e88d0c9a41
commit
8659ac25b4
187
fs/ocfs2/file.c
187
fs/ocfs2/file.c
@ -31,6 +31,7 @@
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#include <linux/pagemap.h>
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#include <linux/uio.h>
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#include <linux/sched.h>
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#include <linux/pipe_fs_i.h>
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#define MLOG_MASK_PREFIX ML_INODE
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#include <cluster/masklog.h>
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@ -943,53 +944,21 @@ out:
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return ret;
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}
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static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
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const struct iovec *iov,
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unsigned long nr_segs,
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loff_t pos)
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static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
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loff_t *ppos,
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size_t count,
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int appending)
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{
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int ret, rw_level = -1, meta_level = -1, have_alloc_sem = 0;
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int ret = 0, meta_level = appending;
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struct inode *inode = dentry->d_inode;
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u32 clusters;
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struct file *filp = iocb->ki_filp;
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struct inode *inode = filp->f_dentry->d_inode;
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loff_t newsize, saved_pos;
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mlog_entry("(0x%p, %u, '%.*s')\n", filp,
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(unsigned int)nr_segs,
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filp->f_dentry->d_name.len,
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filp->f_dentry->d_name.name);
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/* happy write of zero bytes */
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if (iocb->ki_left == 0)
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return 0;
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if (!inode) {
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mlog(0, "bad inode\n");
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return -EIO;
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}
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mutex_lock(&inode->i_mutex);
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/* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
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if (filp->f_flags & O_DIRECT) {
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have_alloc_sem = 1;
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down_read(&inode->i_alloc_sem);
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}
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/* concurrent O_DIRECT writes are allowed */
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rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1;
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ret = ocfs2_rw_lock(inode, rw_level);
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if (ret < 0) {
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rw_level = -1;
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mlog_errno(ret);
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goto out;
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}
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/*
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* We sample i_size under a read level meta lock to see if our write
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* is extending the file, if it is we back off and get a write level
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* meta lock.
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*/
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meta_level = (filp->f_flags & O_APPEND) ? 1 : 0;
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for(;;) {
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ret = ocfs2_meta_lock(inode, NULL, meta_level);
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if (ret < 0) {
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@ -1007,7 +976,7 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
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* inode. There's also the dinode i_size state which
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* can be lost via setattr during extending writes (we
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* set inode->i_size at the end of a write. */
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if (should_remove_suid(filp->f_dentry)) {
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if (should_remove_suid(dentry)) {
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if (meta_level == 0) {
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ocfs2_meta_unlock(inode, meta_level);
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meta_level = 1;
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@ -1017,19 +986,19 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
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ret = ocfs2_write_remove_suid(inode);
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if (ret < 0) {
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mlog_errno(ret);
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goto out;
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goto out_unlock;
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}
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}
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/* work on a copy of ppos until we're sure that we won't have
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* to recalculate it due to relocking. */
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if (filp->f_flags & O_APPEND) {
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if (appending) {
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saved_pos = i_size_read(inode);
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mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
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} else {
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saved_pos = iocb->ki_pos;
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saved_pos = *ppos;
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}
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newsize = iocb->ki_left + saved_pos;
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newsize = count + saved_pos;
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mlog(0, "pos=%lld newsize=%lld cursize=%lld\n",
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(long long) saved_pos, (long long) newsize,
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@ -1062,19 +1031,66 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
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if (!clusters)
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break;
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ret = ocfs2_extend_file(inode, NULL, newsize, iocb->ki_left);
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ret = ocfs2_extend_file(inode, NULL, newsize, count);
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if (ret < 0) {
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if (ret != -ENOSPC)
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mlog_errno(ret);
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goto out;
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goto out_unlock;
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}
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break;
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}
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/* ok, we're done with i_size and alloc work */
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iocb->ki_pos = saved_pos;
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if (appending)
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*ppos = saved_pos;
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out_unlock:
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ocfs2_meta_unlock(inode, meta_level);
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meta_level = -1;
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out:
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return ret;
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}
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static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
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const struct iovec *iov,
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unsigned long nr_segs,
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loff_t pos)
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{
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int ret, rw_level, have_alloc_sem = 0;
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struct file *filp = iocb->ki_filp;
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struct inode *inode = filp->f_dentry->d_inode;
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int appending = filp->f_flags & O_APPEND ? 1 : 0;
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mlog_entry("(0x%p, %u, '%.*s')\n", filp,
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(unsigned int)nr_segs,
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filp->f_dentry->d_name.len,
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filp->f_dentry->d_name.name);
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/* happy write of zero bytes */
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if (iocb->ki_left == 0)
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return 0;
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mutex_lock(&inode->i_mutex);
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/* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
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if (filp->f_flags & O_DIRECT) {
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have_alloc_sem = 1;
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down_read(&inode->i_alloc_sem);
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}
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/* concurrent O_DIRECT writes are allowed */
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rw_level = (filp->f_flags & O_DIRECT) ? 0 : 1;
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ret = ocfs2_rw_lock(inode, rw_level);
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if (ret < 0) {
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rw_level = -1;
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mlog_errno(ret);
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goto out;
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}
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ret = ocfs2_prepare_inode_for_write(filp->f_dentry, &iocb->ki_pos,
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iocb->ki_left, appending);
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if (ret < 0) {
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mlog_errno(ret);
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goto out;
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}
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/* communicate with ocfs2_dio_end_io */
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ocfs2_iocb_set_rw_locked(iocb);
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@ -1100,8 +1116,6 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
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}
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out:
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if (meta_level != -1)
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ocfs2_meta_unlock(inode, meta_level);
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if (have_alloc_sem)
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up_read(&inode->i_alloc_sem);
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if (rw_level != -1)
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@ -1112,6 +1126,77 @@ out:
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return ret;
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}
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static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
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struct file *out,
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loff_t *ppos,
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size_t len,
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unsigned int flags)
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{
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int ret;
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struct inode *inode = out->f_dentry->d_inode;
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mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
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(unsigned int)len,
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out->f_dentry->d_name.len,
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out->f_dentry->d_name.name);
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inode_double_lock(inode, pipe->inode);
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ret = ocfs2_rw_lock(inode, 1);
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if (ret < 0) {
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mlog_errno(ret);
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goto out;
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}
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ret = ocfs2_prepare_inode_for_write(out->f_dentry, ppos, len, 0);
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if (ret < 0) {
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mlog_errno(ret);
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goto out_unlock;
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}
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/* ok, we're done with i_size and alloc work */
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ret = generic_file_splice_write_nolock(pipe, out, ppos, len, flags);
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out_unlock:
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ocfs2_rw_unlock(inode, 1);
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out:
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inode_double_unlock(inode, pipe->inode);
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mlog_exit(ret);
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return ret;
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}
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static ssize_t ocfs2_file_splice_read(struct file *in,
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loff_t *ppos,
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struct pipe_inode_info *pipe,
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size_t len,
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unsigned int flags)
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{
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int ret = 0;
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struct inode *inode = in->f_dentry->d_inode;
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mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
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(unsigned int)len,
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in->f_dentry->d_name.len,
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in->f_dentry->d_name.name);
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/*
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* See the comment in ocfs2_file_aio_read()
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*/
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ret = ocfs2_meta_lock(inode, NULL, 0);
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if (ret < 0) {
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mlog_errno(ret);
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goto bail;
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}
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ocfs2_meta_unlock(inode, 0);
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ret = generic_file_splice_read(in, ppos, pipe, len, flags);
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bail:
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mlog_exit(ret);
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return ret;
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}
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static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
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const struct iovec *iov,
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unsigned long nr_segs,
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@ -1210,6 +1295,8 @@ const struct file_operations ocfs2_fops = {
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.aio_read = ocfs2_file_aio_read,
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.aio_write = ocfs2_file_aio_write,
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.ioctl = ocfs2_ioctl,
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.splice_read = ocfs2_file_splice_read,
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.splice_write = ocfs2_file_splice_write,
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};
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const struct file_operations ocfs2_dops = {
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