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| author | Jan Kara <jack@suse.cz> | 2008-01-28 23:58:27 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-01-28 23:58:27 -0500 |
| commit | a72d7f834e1afa08421938d7eb06bd8e56b0e58c (patch) | |
| tree | 21c6fbbf4187fa8ba56878ea2d5e576e123e1f95 /include/linux/ext4_fs.h | |
| parent | afc7cbca5bfd556c3e12d3acefbee5ab0cbd4670 (diff) | |
| download | lwn-a72d7f834e1afa08421938d7eb06bd8e56b0e58c.tar.gz lwn-a72d7f834e1afa08421938d7eb06bd8e56b0e58c.zip | |
ext4: Avoid rec_len overflow with 64KB block size
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>
Diffstat (limited to 'include/linux/ext4_fs.h')
| -rw-r--r-- | include/linux/ext4_fs.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h index dfe4487fc739..fb31c1aba989 100644 --- a/include/linux/ext4_fs.h +++ b/include/linux/ext4_fs.h @@ -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 |