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| author | Namjae Jeon <namjae.jeon@samsung.com> | 2013-04-30 03:21:10 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-04-30 05:28:40 +0400 |
| commit | e22a444275d1e7c80db5d8bec08fb8d0d79617ad (patch) | |
| tree | b69291b4b24a733f6d5ec6178e1cc9059e5dc5bf /fs/fat | |
| parent | f21735d5873ad6c0d71fc15ebbbeda9ef445009b (diff) | |
| download | linux-e22a444275d1e7c80db5d8bec08fb8d0d79617ad.tar.xz | |
fat: introduce a helper fat_get_blknr_offset()
Introduce helper function to get the block number and offset for a given
i_pos value. Use it in __fat_write_inode() now and later on in nfs.c
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Ravishankar N <ravi.n1@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fat')
| -rw-r--r-- | fs/fat/fat.h | 7 | ||||
| -rw-r--r-- | fs/fat/inode.c | 9 |
2 files changed, 12 insertions, 4 deletions
diff --git a/fs/fat/fat.h b/fs/fat/fat.h index f16948ed5bf8..980c0346c168 100644 --- a/fs/fat/fat.h +++ b/fs/fat/fat.h @@ -218,6 +218,13 @@ static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus) + sbi->data_start; } +static inline void fat_get_blknr_offset(struct msdos_sb_info *sbi, + loff_t i_pos, sector_t *blknr, int *offset) +{ + *blknr = i_pos >> sbi->dir_per_block_bits; + *offset = i_pos & (sbi->dir_per_block - 1); +} + static inline loff_t fat_i_pos_read(struct msdos_sb_info *sbi, struct inode *inode) { diff --git a/fs/fat/inode.c b/fs/fat/inode.c index 78e363c844cb..68cb5a6eb539 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -662,7 +662,8 @@ static int __fat_write_inode(struct inode *inode, int wait) struct buffer_head *bh; struct msdos_dir_entry *raw_entry; loff_t i_pos; - int err; + sector_t blocknr; + int err, offset; if (inode->i_ino == MSDOS_ROOT_INO) return 0; @@ -672,7 +673,8 @@ retry: if (!i_pos) return 0; - bh = sb_bread(sb, i_pos >> sbi->dir_per_block_bits); + fat_get_blknr_offset(sbi, i_pos, &blocknr, &offset); + bh = sb_bread(sb, blocknr); if (!bh) { fat_msg(sb, KERN_ERR, "unable to read inode block " "for updating (i_pos %lld)", i_pos); @@ -685,8 +687,7 @@ retry: goto retry; } - raw_entry = &((struct msdos_dir_entry *) (bh->b_data)) - [i_pos & (sbi->dir_per_block - 1)]; + raw_entry = &((struct msdos_dir_entry *) (bh->b_data))[offset]; if (S_ISDIR(inode->i_mode)) raw_entry->size = 0; else |