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ext4: 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 lenght. So we store 0xffff instead and convert
value when read from / written to disk. The patch also converts some places
to use ext4_next_entry() when we are changing them anyway.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
This commit is contained in:
Jan Kara
2008-01-28 23:58:27 -05:00
committed by Theodore Ts'o
parent afc7cbca5b
commit a72d7f834e
3 changed files with 63 additions and 46 deletions
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20
include/linux/ext4_fs.h
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@@ -767,6 +767,26 @@ struct ext4_dir_entry_2 {
#define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
#define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
~EXT4_DIR_ROUND)
#define EXT4_MAX_REC_LEN ((1<<16)-1)
static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
{
unsigned len = le16_to_cpu(dlen);
if (len == EXT4_MAX_REC_LEN)
return 1 << 16;
return len;
}
static inline __le16 ext4_rec_len_to_disk(unsigned len)
{
if (len == (1 << 16))
return cpu_to_le16(EXT4_MAX_REC_LEN);
else if (len > (1 << 16))
BUG();
return cpu_to_le16(len);
}
/*
* Hash Tree Directory indexing
* (c) Daniel Phillips, 2001