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After reading a bitmap block for i-nodes or blocks, recheck the count of

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free i-nodes or blocks to handle a race where another thread might have
allocated the last i-node or block while we were waiting for the buffer.

Tested by:	dougb
This commit is contained in:
John Baldwin 2011-02-08 13:02:25 +00:00
parent e0e5b8b471
commit 73dd6d1f8f
1 changed files with 18 additions and 0 deletions
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18
sys/fs/ext2fs/ext2_alloc.c
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@ -650,6 +650,15 @@ ext2_alloccg(struct inode *ip, int cg, daddr_t bpref, int size)
EXT2_LOCK(ump);
return (0);
}
if (fs->e2fs_gd[cg].ext2bgd_nbfree == 0) {
/*
* Another thread allocated the last block in this
* group while we were waiting for the buffer.
*/
brelse(bp);
EXT2_LOCK(ump);
return (0);
}
bbp = (char *)bp->b_data;
if (dtog(fs, bpref) != cg)
@ -776,6 +785,15 @@ ext2_nodealloccg(struct inode *ip, int cg, daddr_t ipref, int mode)
EXT2_LOCK(ump);
return (0);
}
if (fs->e2fs_gd[cg].ext2bgd_nifree == 0) {
/*
* Another thread allocated the last i-node in this
* group while we were waiting for the buffer.
*/
brelse(bp);
EXT2_LOCK(ump);
return (0);
}
ibp = (char *)bp->b_data;
if (ipref) {
ipref %= fs->e2fs->e2fs_ipg;