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ext4: add interface to advertise ext4 features in sysfs

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User-space should have the opportunity to check what features doest ext4
support in each particular copy. This adds easy interface by creating new
"features" directory in sys/fs/ext4/. In that directory files
advertising feature names can be created.

Add lazy_itable_init to the feature list.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Lukas Czerner
2010-10-27 21:30:05 -04:00
committed by Theodore Ts'o
parent bfff68738f
commit 857ac889cc
3 changed files with 65 additions and 11 deletions
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19
fs/ext4/ialloc.c
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@@ -1274,6 +1274,16 @@ extern int ext4_init_inode_table(struct super_block *sb, ext4_group_t group,
ext4_itable_unused_count(sb, gdp)),
sbi->s_inodes_per_block);
if ((used_blks < 0) || (used_blks > sbi->s_itb_per_group)) {
ext4_error(sb, "Something is wrong with group %u\n"
"Used itable blocks: %d"
"itable unused count: %u\n",
group, used_blks,
ext4_itable_unused_count(sb, gdp));
ret = 1;
goto out;
}
blk = ext4_inode_table(sb, gdp) + used_blks;
num = sbi->s_itb_per_group - used_blks;
@@ -1283,15 +1293,6 @@ extern int ext4_init_inode_table(struct super_block *sb, ext4_group_t group,
if (ret)
goto err_out;
if (unlikely(num > EXT4_INODES_PER_GROUP(sb))) {
ext4_error(sb, "Something is wrong with group %u\n"
"Used itable blocks: %d"
"Itable blocks per group: %lu\n",
group, used_blks, sbi->s_itb_per_group);
ret = 1;
goto err_out;
}
/*
* Skip zeroout if the inode table is full. But we set the ZEROED
* flag anyway, because obviously, when it is full it does not need