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| author | Steven J. Magnani <steve@digidescorp.com> | 2012-07-11 14:02:42 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-11 16:04:47 -0700 |
| commit | 5d8ecbbc284f7e7568969574a6601b05f1ed1d90 (patch) | |
| tree | 05c658069a610baaa0eeba8ed48e0689a191ec05 /fs/fat | |
| parent | c46938d4f3ecadd609a06dae0d5b26a30274b338 (diff) | |
| download | linux-5d8ecbbc284f7e7568969574a6601b05f1ed1d90.tar.gz linux-5d8ecbbc284f7e7568969574a6601b05f1ed1d90.tar.bz2 linux-5d8ecbbc284f7e7568969574a6601b05f1ed1d90.zip | |
fat: fix non-atomic NFS i_pos read
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>
Diffstat (limited to 'fs/fat')
| -rw-r--r-- | fs/fat/inode.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/fs/fat/inode.c b/fs/fat/inode.c index a3d81ebf6d86..0038b32cb362 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -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; |