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| author | Eric Sandeen <sandeen@redhat.com> | 2008-02-06 01:38:37 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-06 10:41:13 -0800 |
| commit | af440f52927e4b6941aa94e3cfc698adb0f22663 (patch) | |
| tree | 00a7fdc2b09e8e6146f0fd0bc055688d58eea939 /fs/ecryptfs/main.c | |
| parent | 19e66a67e9b25874cd5e184e7d381ce1b955df11 (diff) | |
| download | kernel_samsung_smdk4412-af440f52927e4b6941aa94e3cfc698adb0f22663.tar.gz kernel_samsung_smdk4412-af440f52927e4b6941aa94e3cfc698adb0f22663.tar.bz2 kernel_samsung_smdk4412-af440f52927e4b6941aa94e3cfc698adb0f22663.zip | |
ecryptfs: check for existing key_tfm at mount time
Jeff Moyer pointed out that a mount; umount loop of ecryptfs, with the same
cipher & other mount options, created a new ecryptfs_key_tfm_cache item
each time, and the cache could grow quite large this way.
Looking at this with mhalcrow, we saw that ecryptfs_parse_options()
unconditionally called ecryptfs_add_new_key_tfm(), which is what was adding
these items.
Refactor ecryptfs_get_tfm_and_mutex_for_cipher_name() to create a new
helper function, ecryptfs_tfm_exists(), which checks for the cipher on the
cached key_tfm_list, and sets a pointer to it if it exists. This can then
be called from ecryptfs_parse_options(), and new key_tfm's can be added
only when a cached one is not found.
With list locking changes suggested by akpm.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ecryptfs/main.c')
| -rw-r--r-- | fs/ecryptfs/main.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c index dc620fc1659..778c420e4ca 100644 --- a/fs/ecryptfs/main.c +++ b/fs/ecryptfs/main.c @@ -410,9 +410,13 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options) if (!cipher_key_bytes_set) { mount_crypt_stat->global_default_cipher_key_size = 0; } - rc = ecryptfs_add_new_key_tfm( - NULL, mount_crypt_stat->global_default_cipher_name, - mount_crypt_stat->global_default_cipher_key_size); + mutex_lock(&key_tfm_list_mutex); + if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name, + NULL)) + rc = ecryptfs_add_new_key_tfm( + NULL, mount_crypt_stat->global_default_cipher_name, + mount_crypt_stat->global_default_cipher_key_size); + mutex_unlock(&key_tfm_list_mutex); if (rc) { printk(KERN_ERR "Error attempting to initialize cipher with " "name = [%s] and key size = [%td]; rc = [%d]\n", |