linux.git/fs/f2fs/segment.h, branch v3.19

f2fs: do not skip any writes under memory pressure

2014-11-10T14:51:38+00:00

Under memory pressure, let's avoid skipping data writes.

Signed-off-by: Jaegeuk Kim

f2fs: introduce f2fs_change_bit to simplify the change bit logic

2014-11-04T00:07:36+00:00

Introduce f2fs_change_bit to simplify the change bit logic in
function set_to_next_nat{sit}.

Signed-off-by: Gu Zheng 
Signed-off-by: Jaegeuk Kim

f2fs: support atomic writes

2014-10-07T00:39:50+00:00

This patch introduces a very limited functionality for atomic write support.
In order to support atomic write, this patch adds two ioctls:
 o F2FS_IOC_START_ATOMIC_WRITE
 o F2FS_IOC_COMMIT_ATOMIC_WRITE

The database engine should be aware of the following sequence.
1. open
 -> ioctl(F2FS_IOC_START_ATOMIC_WRITE);
2. writes
  : all the written data will be treated as atomic pages.
3. commit
 -> ioctl(F2FS_IOC_COMMIT_ATOMIC_WRITE);
  : this flushes all the data blocks to the disk, which will be shown all or
  nothing by f2fs recovery procedure.
4. repeat to #2.

The IO pattens should be:

  ,- START_ATOMIC_WRITE                  ,- COMMIT_ATOMIC_WRITE
 CP | D D D D D D | FSYNC | D D D D | FSYNC ...
                      `- COMMIT_ATOMIC_WRITE

Signed-off-by: Jaegeuk Kim

f2fs: potential shift wrapping buf in f2fs_trim_fs()

2014-09-30T22:34:56+00:00

My static checker complains that segment is a u64 but only the lower 31
bits can be used before we hit a shift wrapping bug.

Signed-off-by: Dan Carpenter 
Signed-off-by: Jaegeuk Kim

f2fs: check the use of macros on block counts and addresses

2014-09-30T22:34:47+00:00

This patch cleans up the existing and new macros for readability.

Rule is like this.

         ,-----------------------------------------> MAX_BLKADDR -,
         |  ,------------- TOTAL_BLKS ----------------------------,
         |  |                                                     |
         |  ,- seg0_blkaddr   ,----- sit/nat/ssa/main blkaddress  |
block    |  | (SEG0_BLKADDR)  | | | |   (e.g., MAIN_BLKADDR)      |
address  0..x................ a b c d .............................
            |                                                     |
global seg# 0...................... m .............................
            |                       |                             |
            |                       `------- MAIN_SEGS -----------'
            `-------------- TOTAL_SEGS ---------------------------'
                                    |                             |
 seg#                               0..........xx..................

= Note =
 o GET_SEGNO_FROM_SEG0 : blk address -> global segno
 o GET_SEGNO           : blk address -> segno
 o START_BLOCK         : segno -> starting block address

Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: use more free segments until SSR is activated

2014-09-23T18:10:24+00:00

Previously, f2fs activates SSR if the # of free segments reaches to the # of
overprovisioned segments.
In this case, SSR starts to use dirty segments only, so that the overprovisoned
space cannot be selected for new data.
This means that we have no chance to utilizae the overprovisioned space at all.

This patch fixes that by allowing LFS allocations until the # of free segments
reaches to the last threshold, reserved space.

Signed-off-by: Jaegeuk Kim

f2fs: change the ipu_policy option to enable combinations

2014-09-23T18:10:24+00:00

This patch changes the ipu_policy setting to use any combination of orthogonal policies.

Signed-off-by: Changman Lee 
Signed-off-by: Jaegeuk Kim

f2fs: support large sector size

2014-09-23T18:10:20+00:00

Block size in f2fs is 4096 bytes, so theoretically, f2fs can support 4096 bytes
sector device at maximum. But now f2fs only support 512 bytes size sector, so
block device such as zRAM which uses page cache as its block storage space will
not be mounted successfully as mismatch between sector size of zRAM and sector
size of f2fs supported.

In this patch we support large sector size in f2fs, so block device with sector
size of 512/1024/2048/4096 bytes can be supported in f2fs.

Signed-off-by: Chao Yu 
Signed-off-by: Jaegeuk Kim

f2fs: use MAX_BIO_BLOCKS(sbi)

2014-09-23T18:10:18+00:00

This patch cleans up a simple macro.

Signed-off-by: Jaegeuk Kim

f2fs: use meta_inode cache to improve roll-forward speed

2014-09-23T18:10:12+00:00

Previously, all the dnode pages should be read during the roll-forward recovery.
Even worsely, whole the chain was traversed twice.
This patch removes that redundant and costly read operations by using page cache
of meta_inode and readahead function as well.

Reviewed-by: Chao Yu 
Signed-off-by: Jaegeuk Kim