diff options
| author |   Ritesh Harjani <riteshh@linux.ibm.com> | 2019-10-16 13:07:10 +0530 |
|---|---|---|
| committer |   Theodore Ts'o <tytso@mit.edu> | 2019-10-22 15:32:53 -0400 |
| commit | c8cc88163f40df39e50cda63ac361631864b453e (patch) | |
| tree | f562970d46082d4f02ffa4f19faf15a1a97f94b8 /fs/ext4/ext4.h | |
| parent | ext4: Refactor mpage_map_and_submit_buffers function (diff) | |
| download | linux-dev-c8cc88163f40df39e50cda63ac361631864b453e.tar.xz linux-dev-c8cc88163f40df39e50cda63ac361631864b453e.zip | |
ext4: Add support for blocksize < pagesize in dioread_nolock
This patch adds the support for blocksize < pagesize for
dioread_nolock feature.
Since in case of blocksize < pagesize, we can have multiple
small buffers of page as unwritten extents, we need to
maintain a vector of these unwritten extents which needs
the conversion after the IO is complete. Thus, we maintain
a list of tuple <offset, size> pair (io_end_vec) for this &
traverse this list to do the unwritten to written conversion.
Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Link: https://lore.kernel.org/r/20191016073711.4141-5-riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 8d924bd19ca7..3616f1b0c987 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -198,6 +198,12 @@ struct ext4_system_blocks { */ #define EXT4_IO_END_UNWRITTEN 0x0001 +struct ext4_io_end_vec { + struct list_head list; /* list of io_end_vec */ + loff_t offset; /* offset in the file */ + ssize_t size; /* size of the extent */ +}; + /* * For converting unwritten extents on a work queue. 'handle' is used for * buffered writeback. @@ -211,8 +217,7 @@ typedef struct ext4_io_end { * bios covering the extent */ unsigned int flag; /* unwritten or not */ atomic_t count; /* reference counter */ - loff_t offset; /* offset in the file */ - ssize_t size; /* size of the extent */ + struct list_head list_vec; /* list of ext4_io_end_vec */ } ext4_io_end_t; struct ext4_io_submit { @@ -3324,6 +3329,8 @@ extern int ext4_bio_write_page(struct ext4_io_submit *io, int len, struct writeback_control *wbc, bool keep_towrite); +extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end); +extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end); /* mmp.c */ extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t); |