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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-06-10 16:51:30 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-06-11 05:21:46 +0200 |
| commit | 8387ff2577eb9ed245df9a39947f66976c6bcd02 (patch) | |
| tree | 79fafcb5777f16e520d1c39e9389039f866b4c6d /fs/jffs2/dir.c | |
| parent | Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dledfo... (diff) | |
| download | linux-8387ff2577eb9ed245df9a39947f66976c6bcd02.tar.xz linux-8387ff2577eb9ed245df9a39947f66976c6bcd02.zip | |
vfs: make the string hashes salt the hash
We always mixed in the parent pointer into the dentry name hash, but we
did it late at lookup time. It turns out that we can simplify that
lookup-time action by salting the hash with the parent pointer early
instead of late.
A few other users of our string hashes also wanted to mix in their own
pointers into the hash, and those are updated to use the same mechanism.
Hash users that don't have any particular initial salt can just use the
NULL pointer as a no-salt.
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Cc: George Spelvin <linux@sciencehorizons.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/jffs2/dir.c')
| -rw-r--r-- | fs/jffs2/dir.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c index 84c4bf3631a2..30eb33ff8189 100644 --- a/fs/jffs2/dir.c +++ b/fs/jffs2/dir.c @@ -81,6 +81,7 @@ static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, struct jffs2_full_dirent *fd = NULL, *fd_list; uint32_t ino = 0; struct inode *inode = NULL; + unsigned int nhash; jffs2_dbg(1, "jffs2_lookup()\n"); @@ -89,11 +90,14 @@ static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, dir_f = JFFS2_INODE_INFO(dir_i); + /* The 'nhash' on the fd_list is not the same as the dentry hash */ + nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len); + mutex_lock(&dir_f->sem); /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ - for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { - if (fd_list->nhash == target->d_name.hash && + for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) { + if (fd_list->nhash == nhash && (!fd || fd_list->version > fd->version) && strlen(fd_list->name) == target->d_name.len && !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { |