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fat: fix non-atomic NFS i_pos read

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fat_encode_fh() can fetch an invalid i_pos value on systems where 64-bit
accesses are not atomic.  Make it use the same accessor as the rest of the
FAT code.

Signed-off-by: Steven J. Magnani <steve@digidescorp.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>
This commit is contained in:
Steven J. Magnani 2012-07-11 14:02:42 -07:00 committed by Linus Torvalds
parent c46938d4f3
commit 5d8ecbbc28
1 changed files with 6 additions and 7 deletions
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13
fs/fat/inode.c
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@ -738,22 +738,21 @@ static int
fat_encode_fh(struct inode *inode, __u32 *fh, int *lenp, struct inode *parent)
{
int len = *lenp;
u32 ipos_h, ipos_m, ipos_l;
struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
loff_t i_pos;
if (len < 5) {
*lenp = 5;
return 255; /* no room */
}
ipos_h = MSDOS_I(inode)->i_pos >> 8;
ipos_m = (MSDOS_I(inode)->i_pos & 0xf0) << 24;
ipos_l = (MSDOS_I(inode)->i_pos & 0x0f) << 28;
i_pos = fat_i_pos_read(sbi, inode);
*lenp = 5;
fh[0] = inode->i_ino;
fh[1] = inode->i_generation;
fh[2] = ipos_h;
fh[3] = ipos_m | MSDOS_I(inode)->i_logstart;
fh[4] = ipos_l;
fh[2] = i_pos >> 8;
fh[3] = ((i_pos & 0xf0) << 24) | MSDOS_I(inode)->i_logstart;
fh[4] = (i_pos & 0x0f) << 28;
if (parent)
fh[4] |= MSDOS_I(parent)->i_logstart;
return 3;