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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2008-10-08 23:12:24 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-10-08 23:12:24 -0400 |
| commit | 5c79161689aede2d487d707d5931a22eadf66120 (patch) | |
| tree | 994177ca7118a515d23f0375ab080c216159d9c8 /fs/ext4/balloc.c | |
| parent | 79f0be8d2e6ebde27dfb3beff18eb689d5c4e36c (diff) | |
| download | lwn-5c79161689aede2d487d707d5931a22eadf66120.tar.gz lwn-5c79161689aede2d487d707d5931a22eadf66120.zip | |
ext4: Signed arithmetic fix
This patch converts some usage of ext4_fsblk_t to s64. This is needed
so that some of the sign conversion works as expected in if loops.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/balloc.c')
| -rw-r--r-- | fs/ext4/balloc.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index edef0023e6e6..a425e78c73eb 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -1603,10 +1603,10 @@ out: } int ext4_claim_free_blocks(struct ext4_sb_info *sbi, - ext4_fsblk_t nblocks) + s64 nblocks) { s64 free_blocks, dirty_blocks; - ext4_fsblk_t root_blocks = 0; + s64 root_blocks = 0; struct percpu_counter *fbc = &sbi->s_freeblocks_counter; struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter; @@ -1631,7 +1631,7 @@ int ext4_claim_free_blocks(struct ext4_sb_info *sbi, /* Check whether we have space after * accounting for current dirty blocks */ - if (free_blocks < ((s64)(root_blocks + nblocks) + dirty_blocks)) + if (free_blocks < ((root_blocks + nblocks) + dirty_blocks)) /* we don't have free space */ return -ENOSPC; @@ -1650,10 +1650,10 @@ int ext4_claim_free_blocks(struct ext4_sb_info *sbi, * On success, return nblocks */ ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi, - ext4_fsblk_t nblocks) + s64 nblocks) { - ext4_fsblk_t free_blocks, dirty_blocks; - ext4_fsblk_t root_blocks = 0; + s64 free_blocks, dirty_blocks; + s64 root_blocks = 0; struct percpu_counter *fbc = &sbi->s_freeblocks_counter; struct percpu_counter *dbc = &sbi->s_dirtyblocks_counter; @@ -1667,14 +1667,15 @@ ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi, if (free_blocks - (nblocks + root_blocks + dirty_blocks) < EXT4_FREEBLOCKS_WATERMARK) { - free_blocks = percpu_counter_sum_positive(fbc); - dirty_blocks = percpu_counter_sum_positive(dbc); + free_blocks = percpu_counter_sum(fbc); + dirty_blocks = percpu_counter_sum(dbc); } if (free_blocks <= (root_blocks + dirty_blocks)) /* we don't have free space */ return 0; + if (free_blocks - (root_blocks + dirty_blocks) < nblocks) - return free_blocks - root_blocks; + return free_blocks - (root_blocks + dirty_blocks); return nblocks; } |