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| author | Jan Kara <jack@suse.cz> | 2013-06-04 11:58:58 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-06-04 11:58:58 -0400 |
| commit | 97a851ed71cd9cc2542955e92a001c6ea3d21d35 (patch) | |
| tree | 32a881fb66aa9058c4cdb3d279925a492f3689ca /fs/ext4/ext4.h | |
| parent | 8af8eecc1331dbf5e8c662022272cf667e213da5 (diff) | |
| download | lwn-97a851ed71cd9cc2542955e92a001c6ea3d21d35.tar.gz lwn-97a851ed71cd9cc2542955e92a001c6ea3d21d35.zip | |
ext4: use io_end for multiple bios
Change writeback path to create just one io_end structure for the
extent to which we submit IO and share it among bios writing that
extent. This prevents needless splitting and joining of unwritten
extents when they cannot be submitted as a single bio.
Bugs in ENOMEM handling found by Linux File System Verification project
(linuxtesting.org) and fixed by Alexey Khoroshilov
<khoroshilov@ispras.ru>.
CC: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 019db3c1bc3b..82d2b6000a61 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -209,6 +209,7 @@ typedef struct ext4_io_end { ssize_t size; /* size of the extent */ struct kiocb *iocb; /* iocb struct for AIO */ int result; /* error value for AIO */ + atomic_t count; /* reference counter */ } ext4_io_end_t; struct ext4_io_submit { @@ -2648,11 +2649,14 @@ extern int ext4_move_extents(struct file *o_filp, struct file *d_filp, /* page-io.c */ extern int __init ext4_init_pageio(void); -extern void ext4_add_complete_io(ext4_io_end_t *io_end); extern void ext4_exit_pageio(void); extern void ext4_ioend_shutdown(struct inode *); -extern void ext4_free_io_end(ext4_io_end_t *io); extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags); +extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end); +extern int ext4_put_io_end(ext4_io_end_t *io_end); +extern void ext4_put_io_end_defer(ext4_io_end_t *io_end); +extern void ext4_io_submit_init(struct ext4_io_submit *io, + struct writeback_control *wbc); extern void ext4_end_io_work(struct work_struct *work); extern void ext4_io_submit(struct ext4_io_submit *io); extern int ext4_bio_write_page(struct ext4_io_submit *io, |