linux-toradex.git/include/linux/nilfs2_fs.h, branch tegra-11.2.10

nilfs2: reject filesystem with unsupported block size

2010-07-25T14:29:21+00:00

This inserts sanity check that refuses to mount a filesystem with
unsupported block size.

Previously, kernel code of nilfs was looking only limitation of
devices though mkfs.nilfs2 limits the range of block sizes; there was
no check that prevents rec_len overflow with larger block sizes.

With this change, block sizes larger than 64KB or smaller than 1KB
will get rejected explicitly by kernel.

Signed-off-by: Ryusuke Konishi

nilfs2: avoid rec_len overflow with 64KB block size

2010-07-25T11:46:43+00:00

With 64KB blocksize, a directory entry can have size 64KB which does
not fit into 16 bits we have for entry length.  So this patch stores
0xffff instead and converts value when read from / written to disk.

Nilfs derives its directory implementation from ext2 filesystem, and
this draws upon the corresponding change on ext2.

Signed-off-by: Ryusuke Konishi

nilfs2: add feature set fields to super block

2010-07-23T01:02:16+00:00

This adds three new fields to nilfs_super_block structure, compatible
feature set, readonly-compatible feature set, and incompatible feature
set in order to prepare for future disk format modifications.

The role of these fields conforms to those of ext3 or other
filesystems.  Most important flags are the incompatible feature set;
it is used to refuse to mount the filesystem which sets an
incompatible feature the kernel doesn't know about.

Signed-off-by: Ryusuke Konishi

nilfs2: clarify byte offset in super block format

2010-07-23T01:02:16+00:00

This inserts comments indicating hexadecimal offset in declaration of
nilfs_super_block structure so that people can know offset of its
fields without counting from the head.

Signed-off-by: Ryusuke Konishi

nilfs2: enlarge s_volume_name member in nilfs_super_block

2010-05-10T02:32:33+00:00

Current s_volume_name has 16 bytes, which is too small as modern filesystem.

s_last_mounted resides just after s_volume_name and has 64 bytes.

s_last_mounted is historically came from ext2, but not used in nilfs2 at all.
Deleting s_last_mounted member and merging that space with s_volume_name
enlarge s_volume_name upto 80 bytes for volume label.

When user land tools see the old header for new disk, it will just ignore
additional bytes stored in s_last_mounted.  While, old disk format has only
16 bytes label, it doesn't affects in case seeing the new header for old disk.

Signed-off-by: Jiro SEKIBA 
Signed-off-by: Ryusuke Konishi

nilfs2: insert checkpoint number in segment summary header

2010-05-10T02:32:31+00:00

This adds a field to record the latest checkpoint number in the
nilfs_segment_summary structure.  This will help to recover the latest
checkpoint number from logs on disk.  This field is intended for
crucial cases in which super blocks have lost pointer to the latest
log.

Even though this will change the disk format, both backward and
forward compatibility is preserved by a size field prepared in the
segment summary header.

Signed-off-by: Ryusuke Konishi

nilfs2: fix style problems in nilfs2_fs.h

2010-05-10T02:32:29+00:00

This kills the following checkpatch warnings:

WARNING: please, no space before tabs
+^I__le32^Is_first_ino; ^I^I/* First non-reserved inode */$

WARNING: please, no space before tabs
+^I__le16  s_inode_size; ^I^I/* Size of an inode */$

WARNING: please, no space before tabs
+^Ichar^Is_volume_name[16]; ^I/* volume name */$

WARNING: please, no space before tabs
+^Ichar^Is_last_mounted[64]; ^I/* directory where last mounted */$

Signed-off-by: Ryusuke Konishi

nilfs2: update comment for struct nilfs_dat_entry

2010-05-10T02:32:29+00:00

The comment of struct nilfs_dat_entry is mismatched, fix it.

Signed-off-by: Qinghuang Feng 
Signed-off-by: Ryusuke Konishi

nilfs2: issue discard request after cleaning segments

2010-02-13T03:26:02+00:00

This adds a function to send discard requests for given array of
segment numbers, and calls the function when garbage collection
succeeded.

Signed-off-by: Jiro SEKIBA 
Signed-off-by: Ryusuke Konishi

nilfs2: add norecovery mount option

2009-11-20T01:05:52+00:00

This adds "norecovery" mount option which disables temporal write
access to read-only mounts or snapshots during mount/recovery.
Without this option, write access will be even performed for those
types of mounts; the temporal write access is needed to mount root
file system read-only after an unclean shutdown.

This option will be helpful when user wants to prevent any write
access to the device.

Signed-off-by: Ryusuke Konishi 
Cc: Eric Sandeen