Messages in this thread Patch in this message | | | Date | Thu, 19 Jun 2003 18:41:13 +0530 | From | Maneesh Soni <> | Subject | [patch 3/3] dentry->d_count fixes |
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- hpfs_unlink() can race with lockless d_lookup(), as we can have situations where d_lookup() has successfully looked-up a dentry and at the sametime hpfs_unlink()--->d_drop() has dropped it. Taking the per dentry lock before checking the d_count in hpfs_unlink() solves this race condition.
fs/hpfs/namei.c | 3 +++ 1 files changed, 3 insertions(+)
diff -puN fs/hpfs/namei.c~hpfs-d_count-fix fs/hpfs/namei.c --- linux-2.5.72-mm2/fs/hpfs/namei.c~hpfs-d_count-fix 2003-06-19 17:46:05.000000000 +0530 +++ linux-2.5.72-mm2-maneesh/fs/hpfs/namei.c 2003-06-19 17:46:19.000000000 +0530 @@ -372,12 +372,15 @@ again: if (rep) goto ret; d_drop(dentry); + spin_lock(&dentry->d_lock); if (atomic_read(&dentry->d_count) > 1 || permission(inode, MAY_WRITE) || get_write_access(inode)) { + spin_unlock(&dentry->d_lock); d_rehash(dentry); goto ret; } + spin_unlock(&dentry->d_lock); /*printk("HPFS: truncating file before delete.\n");*/ newattrs.ia_size = 0; newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME; _ -- Maneesh Soni IBM Linux Technology Center, IBM India Software Lab, Bangalore. Phone: +91-80-5044999 email: maneesh@in.ibm.com http://lse.sourceforge.net/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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