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nilfs2: avoid rec_len overflow with 64KB block size

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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 <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2010-07-25 20:39:03 +09:00
parent c28e69d933
commit 6cda9fa257
2 changed files with 32 additions and 12 deletions
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18
include/linux/nilfs2_fs.h
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@ -326,7 +326,25 @@ enum {
#define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1)
#define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \
~NILFS_DIR_ROUND)
#define NILFS_MAX_REC_LEN ((1<<16)-1)
static inline unsigned nilfs_rec_len_from_disk(__le16 dlen)
{
unsigned len = le16_to_cpu(dlen);
if (len == NILFS_MAX_REC_LEN)
return 1 << 16;
return len;
}
static inline __le16 nilfs_rec_len_to_disk(unsigned len)
{
if (len == (1 << 16))
return cpu_to_le16(NILFS_MAX_REC_LEN);
else if (len > (1 << 16))
BUG();
return cpu_to_le16(len);
}
/**
* struct nilfs_finfo - file information