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| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-07-25 15:39:03 +0400 |
|---|---|---|
| committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-07-25 15:46:43 +0400 |
| commit | 6cda9fa2575ec0869fe77b0bdf295c0e51868cab (patch) | |
| tree | 09f160f79f2ab135cd0c9ce0a2099d96423e5e00 /include/linux/nilfs2_fs.h | |
| parent | c28e69d9332aab739920082a0a5677d861390824 (diff) | |
| download | linux-6cda9fa2575ec0869fe77b0bdf295c0e51868cab.tar.xz | |
nilfs2: 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 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>
Diffstat (limited to 'include/linux/nilfs2_fs.h')
| -rw-r--r-- | include/linux/nilfs2_fs.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h index 7dd4cd494490..970828a5ffc5 100644 --- a/include/linux/nilfs2_fs.h +++ b/include/linux/nilfs2_fs.h @@ -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 |