diff options
| -rw-r--r-- | fs/ext3/dir.c | 15 | ||||
| -rw-r--r-- | include/linux/ext3_fs.h | 9 |
2 files changed, 17 insertions, 7 deletions
diff --git a/fs/ext3/dir.c b/fs/ext3/dir.c index e2e72c367cf6..34f0a072b935 100644 --- a/fs/ext3/dir.c +++ b/fs/ext3/dir.c @@ -69,25 +69,26 @@ int ext3_check_dir_entry (const char * function, struct inode * dir, const char * error_msg = NULL; const int rlen = ext3_rec_len_from_disk(de->rec_len); - if (rlen < EXT3_DIR_REC_LEN(1)) + if (unlikely(rlen < EXT3_DIR_REC_LEN(1))) error_msg = "rec_len is smaller than minimal"; - else if (rlen % 4 != 0) + else if (unlikely(rlen % 4 != 0)) error_msg = "rec_len % 4 != 0"; - else if (rlen < EXT3_DIR_REC_LEN(de->name_len)) + else if (unlikely(rlen < EXT3_DIR_REC_LEN(de->name_len))) error_msg = "rec_len is too small for name_len"; - else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize) + else if (unlikely((((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize))) error_msg = "directory entry across blocks"; - else if (le32_to_cpu(de->inode) > - le32_to_cpu(EXT3_SB(dir->i_sb)->s_es->s_inodes_count)) + else if (unlikely(le32_to_cpu(de->inode) > + le32_to_cpu(EXT3_SB(dir->i_sb)->s_es->s_inodes_count))) error_msg = "inode out of bounds"; - if (error_msg != NULL) + if (unlikely(error_msg != NULL)) ext3_error (dir->i_sb, function, "bad entry in directory #%lu: %s - " "offset=%lu, inode=%lu, rec_len=%d, name_len=%d", dir->i_ino, error_msg, offset, (unsigned long) le32_to_cpu(de->inode), rlen, de->name_len); + return error_msg == NULL ? 1 : 0; } diff --git a/include/linux/ext3_fs.h b/include/linux/ext3_fs.h index a443965946bb..65990ef612f5 100644 --- a/include/linux/ext3_fs.h +++ b/include/linux/ext3_fs.h @@ -724,21 +724,30 @@ struct ext3_dir_entry_2 { ~EXT3_DIR_ROUND) #define EXT3_MAX_REC_LEN ((1<<16)-1) +/* + * Tests against MAX_REC_LEN etc were put in place for 64k block + * sizes; if that is not possible on this arch, we can skip + * those tests and speed things up. + */ static inline unsigned ext3_rec_len_from_disk(__le16 dlen) { unsigned len = le16_to_cpu(dlen); +#if (PAGE_CACHE_SIZE >= 65536) if (len == EXT3_MAX_REC_LEN) return 1 << 16; +#endif return len; } static inline __le16 ext3_rec_len_to_disk(unsigned len) { +#if (PAGE_CACHE_SIZE >= 65536) if (len == (1 << 16)) return cpu_to_le16(EXT3_MAX_REC_LEN); else if (len > (1 << 16)) BUG(); +#endif return cpu_to_le16(len); } |