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path: root/fs/nilfs2/sufile.h
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2009-09-14nilfs2: remove individual gfp constants for each metadata fileRyusuke Konishi
This gets rid of NILFS_CPFILE_GFP, NILFS_SUFILE_GFP, NILFS_DAT_GFP, and NILFS_IFILE_GFP. All of these constants refer to NILFS_MDT_GFP, and can be removed. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-06-10nilfs2: allow future expansion of metadata read out via get info ioctlRyusuke Konishi
Nilfs has some ioctl commands to read out metadata from meta data files: - NILFS_IOCTL_GET_CPINFO for checkpoint file, - NILFS_IOCTL_GET_SUINFO for segment usage file, and - NILFS_IOCTL_GET_VINFO for Disk Address Transalation (DAT) file, respectively. Every routine on these metadata files is implemented so that it allows future expansion of on-disk format. But, the above ioctl commands do not support expansion even though nilfs_argv structure can handle arbitrary size for data exchanged via ioctl. This allows future expansion of the following structures which give basic format of the "get information" ioctls: - struct nilfs_cpinfo - struct nilfs_suinfo - struct nilfs_vinfo So, this introduces forward compatility of such ioctl commands. In this patch, a sanity check in nilfs_ioctl_get_info() function is changed to accept larger data structure [1], and metadata read routines are rewritten so that they become compatible for larger structures; the routines will just ignore the remaining fields which the current version of nilfs doesn't know. [1] The ioctl function already has another upper limit (PAGE_SIZE against a structure, which appears in nilfs_ioctl_wrap_copy function), and this will not cause security problem. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-06-10nilfs2: eliminate removal list of segmentsRyusuke Konishi
This will clean up the removal list of segments and the related functions from segment.c and ioctl.c, which have hurt code readability. This elimination is applied by using nilfs_sufile_updatev() previously introduced in the patch ("nilfs2: add sufile function that can modify multiple segment usages"). Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-06-10nilfs2: add sufile function that can modify multiple segment usagesRyusuke Konishi
This is a preparation for the later cleanup patch ("nilfs2: remove list of freeing segments"). This adds nilfs_sufile_updatev() to sufile, which can modify multiple segment usages at a time. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-04-13nilfs2: fix possible mismatch of sufile counters on recoveryRyusuke Konishi
On-disk counters ndirtysegs and ncleansegs of sufile, can go wrong after roll-forward recovery because nilfs_prepare_segment_for_recovery() function marks segments dirty without adjusting value of these counters. This fixes the problem by adding a function to sufile which does the operation adjusting the counters, and by letting the recovery function use it. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-04-13nilfs2: segment usage file cleanupsRyusuke Konishi
This will simplify sufile.c by sharing common code which repeatedly appears in routines updating a segment usage entry; a wrapper function nilfs_sufile_update() is introduced for the purpose, and counter modifications are integrated to a new function nilfs_sufile_mod_counter(). This is a preparation for the successive bugfix patch ("nilfs2: fix possible mismatch of sufile counters on recovery"). Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
2009-04-07nilfs2: segment usage fileKoji Sato
This adds a meta data file which stores the allocation state of segments. [konishi.ryusuke@lab.ntt.co.jp: fix wrong counting of checkpoints and dirty segments] Signed-off-by: Koji Sato <sato.koji@lab.ntt.co.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>