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ext4: store maxbytes for bitmapped files and return EFBIG as appropriate

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Calculate & store the max offset for bitmapped files, and
catch too-large seeks, truncates, and writes in ext4, shortening
or rejecting as appropriate.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
This commit is contained in:
Eric Sandeen
2008-01-28 23:58:27 -05:00
committed by Theodore Ts'o
parent 19295529db
commit e2b4657453
4 changed files with 35 additions and 2 deletions
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fs/ext4/super.c
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@@ -1922,6 +1922,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
}
}
sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {