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f2fs: Provide a splice-read wrapper

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Provide a splice_read wrapper for f2fs.  This does some checks and tracing
before calling filemap_splice_read() and will update the iostats
afterwards.  Direct I/O is handled by the caller.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Christoph Hellwig <hch@lst.de>
cc: Al Viro <viro@zeniv.linux.org.uk>
cc: Jens Axboe <axboe@kernel.dk>
cc: Jaegeuk Kim <jaegeuk@kernel.org>
cc: Chao Yu <chao@kernel.org>
cc: linux-f2fs-devel@lists.sourceforge.net
cc: linux-fsdevel@vger.kernel.org
cc: linux-block@vger.kernel.org
cc: linux-mm@kvack.org
Link: https://lore.kernel.org/r/20230522135018.2742245-20-dhowells@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
David Howells 2023-05-22 14:50:06 +01:00 committed by Jens Axboe
parent fa6c46e7c2
commit ceb11d0e2d
1 changed files with 35 additions and 8 deletions
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43
fs/f2fs/file.c
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@ -4367,22 +4367,23 @@ out:
return ret;
}
static void f2fs_trace_rw_file_path(struct kiocb *iocb, size_t count, int rw)
static void f2fs_trace_rw_file_path(struct file *file, loff_t pos, size_t count,
int rw)
{
struct inode *inode = file_inode(iocb->ki_filp);
struct inode *inode = file_inode(file);
char *buf, *path;
buf = f2fs_getname(F2FS_I_SB(inode));
if (!buf)
return;
path = dentry_path_raw(file_dentry(iocb->ki_filp), buf, PATH_MAX);
path = dentry_path_raw(file_dentry(file), buf, PATH_MAX);
if (IS_ERR(path))
goto free_buf;
if (rw == WRITE)
trace_f2fs_datawrite_start(inode, iocb->ki_pos, count,
trace_f2fs_datawrite_start(inode, pos, count,
current->pid, path, current->comm);
else
trace_f2fs_dataread_start(inode, iocb->ki_pos, count,
trace_f2fs_dataread_start(inode, pos, count,
current->pid, path, current->comm);
free_buf:
f2fs_putname(buf);
@ -4398,7 +4399,8 @@ static ssize_t f2fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
return -EOPNOTSUPP;
if (trace_f2fs_dataread_start_enabled())
f2fs_trace_rw_file_path(iocb, iov_iter_count(to), READ);
f2fs_trace_rw_file_path(iocb->ki_filp, iocb->ki_pos,
iov_iter_count(to), READ);
if (f2fs_should_use_dio(inode, iocb, to)) {
ret = f2fs_dio_read_iter(iocb, to);
@ -4413,6 +4415,30 @@ static ssize_t f2fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
return ret;
}
static ssize_t f2fs_file_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe,
size_t len, unsigned int flags)
{
struct inode *inode = file_inode(in);
const loff_t pos = *ppos;
ssize_t ret;
if (!f2fs_is_compress_backend_ready(inode))
return -EOPNOTSUPP;
if (trace_f2fs_dataread_start_enabled())
f2fs_trace_rw_file_path(in, pos, len, READ);
ret = filemap_splice_read(in, ppos, pipe, len, flags);
if (ret > 0)
f2fs_update_iostat(F2FS_I_SB(inode), inode,
APP_BUFFERED_READ_IO, ret);
if (trace_f2fs_dataread_end_enabled())
trace_f2fs_dataread_end(inode, pos, ret);
return ret;
}
static ssize_t f2fs_write_checks(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
@ -4714,7 +4740,8 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
ret = preallocated;
} else {
if (trace_f2fs_datawrite_start_enabled())
f2fs_trace_rw_file_path(iocb, orig_count, WRITE);
f2fs_trace_rw_file_path(iocb->ki_filp, iocb->ki_pos,
orig_count, WRITE);
/* Do the actual write. */
ret = dio ?
@ -4919,7 +4946,7 @@ const struct file_operations f2fs_file_operations = {
#ifdef CONFIG_COMPAT
.compat_ioctl = f2fs_compat_ioctl,
#endif
.splice_read = generic_file_splice_read,
.splice_read = f2fs_file_splice_read,
.splice_write = iter_file_splice_write,
.fadvise = f2fs_file_fadvise,
};