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| author | Jens Axboe <jens.axboe@oracle.com> | 2007-06-01 14:52:37 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-07-10 08:04:12 +0200 |
| commit | 534f2aaa6ab07cd71164180bc958a7dcde41db11 (patch) | |
| tree | 4c2557f4c4c3913bbc5e282c98559ef70b92fd4b | |
| parent | vmsplice: add vmsplice-to-user support (diff) | |
| download | linux-534f2aaa6ab07cd71164180bc958a7dcde41db11.tar.xz linux-534f2aaa6ab07cd71164180bc958a7dcde41db11.zip | |
sys_sendfile: switch to using ->splice_read, if available
This patch makes sendfile prefer to use ->splice_read(), if it's
available in the file_operations structure.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| -rw-r--r-- | fs/read_write.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 4d03008f015b..47da8a4a0fbe 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -15,6 +15,7 @@ #include <linux/module.h> #include <linux/syscalls.h> #include <linux/pagemap.h> +#include <linux/pipe_fs_i.h> #include "read_write.h" #include <asm/uaccess.h> @@ -25,7 +26,7 @@ const struct file_operations generic_ro_fops = { .read = do_sync_read, .aio_read = generic_file_aio_read, .mmap = generic_file_readonly_mmap, - .sendfile = generic_file_sendfile, + .splice_read = generic_file_splice_read, }; EXPORT_SYMBOL(generic_ro_fops); @@ -708,7 +709,7 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, struct inode * in_inode, * out_inode; loff_t pos; ssize_t retval; - int fput_needed_in, fput_needed_out; + int fput_needed_in, fput_needed_out, fl; /* * Get input file, and verify that it is ok.. @@ -723,7 +724,8 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, in_inode = in_file->f_path.dentry->d_inode; if (!in_inode) goto fput_in; - if (!in_file->f_op || !in_file->f_op->sendfile) + if (!in_file->f_op || (!in_file->f_op->sendfile && + !in_file->f_op->splice_read)) goto fput_in; retval = -ESPIPE; if (!ppos) @@ -776,7 +778,21 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, count = max - pos; } - retval = in_file->f_op->sendfile(in_file, ppos, count, file_send_actor, out_file); + if (in_file->f_op->splice_read) { + fl = 0; +#if 0 + /* + * We need to debate whether we can enable this or not. The + * man page documents EAGAIN return for the output at least, + * and the application is arguably buggy if it doesn't expect + * EAGAIN on a non-blocking file descriptor. + */ + if (in_file->f_flags & O_NONBLOCK) + fl = SPLICE_F_NONBLOCK; +#endif + retval = do_splice_direct(in_file, ppos, out_file, count, fl); + } else + retval = in_file->f_op->sendfile(in_file, ppos, count, file_send_actor, out_file); if (retval > 0) { add_rchar(current, retval); |