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authorEric Biggers <ebiggers@google.com>2019-10-09 16:34:17 -0700
committerEric Biggers <ebiggers@google.com>2019-10-21 13:22:08 -0700
commit1565bdad59e97f31cfc7b065bc0fc77e9549e62d (patch)
treedc5189446da62dea74b6b3792c892b0e032ef51f /fs/crypto/crypto.c
parent4006d799d93b159fd834c50999265b5c534a71d5 (diff)
fscrypt: remove struct fscrypt_ctx
Now that ext4 and f2fs implement their own post-read workflow that supports both fscrypt and fsverity, the fscrypt-only workflow based around struct fscrypt_ctx is no longer used. So remove the unused code. This is based on a patch from Chandan Rajendra's "Consolidate FS read I/O callbacks code" patchset, but rebased onto the latest kernel, folded __fscrypt_decrypt_bio() into fscrypt_decrypt_bio(), cleaned up fscrypt_initialize(), and updated the commit message. Originally-from: Chandan Rajendra <chandan@linux.ibm.com> Signed-off-by: Eric Biggers <ebiggers@google.com>
Diffstat (limited to 'fs/crypto/crypto.c')
-rw-r--r--fs/crypto/crypto.c110
1 files changed, 9 insertions, 101 deletions
diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c
index 6bc3e4f1e657..ced8ad9f2d01 100644
--- a/fs/crypto/crypto.c
+++ b/fs/crypto/crypto.c
@@ -31,24 +31,16 @@
#include "fscrypt_private.h"
static unsigned int num_prealloc_crypto_pages = 32;
-static unsigned int num_prealloc_crypto_ctxs = 128;
module_param(num_prealloc_crypto_pages, uint, 0444);
MODULE_PARM_DESC(num_prealloc_crypto_pages,
"Number of crypto pages to preallocate");
-module_param(num_prealloc_crypto_ctxs, uint, 0444);
-MODULE_PARM_DESC(num_prealloc_crypto_ctxs,
- "Number of crypto contexts to preallocate");
static mempool_t *fscrypt_bounce_page_pool = NULL;
-static LIST_HEAD(fscrypt_free_ctxs);
-static DEFINE_SPINLOCK(fscrypt_ctx_lock);
-
static struct workqueue_struct *fscrypt_read_workqueue;
static DEFINE_MUTEX(fscrypt_init_mutex);
-static struct kmem_cache *fscrypt_ctx_cachep;
struct kmem_cache *fscrypt_info_cachep;
void fscrypt_enqueue_decrypt_work(struct work_struct *work)
@@ -57,62 +49,6 @@ void fscrypt_enqueue_decrypt_work(struct work_struct *work)
}
EXPORT_SYMBOL(fscrypt_enqueue_decrypt_work);
-/**
- * fscrypt_release_ctx() - Release a decryption context
- * @ctx: The decryption context to release.
- *
- * If the decryption context was allocated from the pre-allocated pool, return
- * it to that pool. Else, free it.
- */
-void fscrypt_release_ctx(struct fscrypt_ctx *ctx)
-{
- unsigned long flags;
-
- if (ctx->flags & FS_CTX_REQUIRES_FREE_ENCRYPT_FL) {
- kmem_cache_free(fscrypt_ctx_cachep, ctx);
- } else {
- spin_lock_irqsave(&fscrypt_ctx_lock, flags);
- list_add(&ctx->free_list, &fscrypt_free_ctxs);
- spin_unlock_irqrestore(&fscrypt_ctx_lock, flags);
- }
-}
-EXPORT_SYMBOL(fscrypt_release_ctx);
-
-/**
- * fscrypt_get_ctx() - Get a decryption context
- * @gfp_flags: The gfp flag for memory allocation
- *
- * Allocate and initialize a decryption context.
- *
- * Return: A new decryption context on success; an ERR_PTR() otherwise.
- */
-struct fscrypt_ctx *fscrypt_get_ctx(gfp_t gfp_flags)
-{
- struct fscrypt_ctx *ctx;
- unsigned long flags;
-
- /*
- * First try getting a ctx from the free list so that we don't have to
- * call into the slab allocator.
- */
- spin_lock_irqsave(&fscrypt_ctx_lock, flags);
- ctx = list_first_entry_or_null(&fscrypt_free_ctxs,
- struct fscrypt_ctx, free_list);
- if (ctx)
- list_del(&ctx->free_list);
- spin_unlock_irqrestore(&fscrypt_ctx_lock, flags);
- if (!ctx) {
- ctx = kmem_cache_zalloc(fscrypt_ctx_cachep, gfp_flags);
- if (!ctx)
- return ERR_PTR(-ENOMEM);
- ctx->flags |= FS_CTX_REQUIRES_FREE_ENCRYPT_FL;
- } else {
- ctx->flags &= ~FS_CTX_REQUIRES_FREE_ENCRYPT_FL;
- }
- return ctx;
-}
-EXPORT_SYMBOL(fscrypt_get_ctx);
-
struct page *fscrypt_alloc_bounce_page(gfp_t gfp_flags)
{
return mempool_alloc(fscrypt_bounce_page_pool, gfp_flags);
@@ -392,17 +328,6 @@ const struct dentry_operations fscrypt_d_ops = {
.d_revalidate = fscrypt_d_revalidate,
};
-static void fscrypt_destroy(void)
-{
- struct fscrypt_ctx *pos, *n;
-
- list_for_each_entry_safe(pos, n, &fscrypt_free_ctxs, free_list)
- kmem_cache_free(fscrypt_ctx_cachep, pos);
- INIT_LIST_HEAD(&fscrypt_free_ctxs);
- mempool_destroy(fscrypt_bounce_page_pool);
- fscrypt_bounce_page_pool = NULL;
-}
-
/**
* fscrypt_initialize() - allocate major buffers for fs encryption.
* @cop_flags: fscrypt operations flags
@@ -410,11 +335,11 @@ static void fscrypt_destroy(void)
* We only call this when we start accessing encrypted files, since it
* results in memory getting allocated that wouldn't otherwise be used.
*
- * Return: Zero on success, non-zero otherwise.
+ * Return: 0 on success; -errno on failure
*/
int fscrypt_initialize(unsigned int cop_flags)
{
- int i, res = -ENOMEM;
+ int err = 0;
/* No need to allocate a bounce page pool if this FS won't use it. */
if (cop_flags & FS_CFLG_OWN_PAGES)
@@ -422,29 +347,18 @@ int fscrypt_initialize(unsigned int cop_flags)
mutex_lock(&fscrypt_init_mutex);
if (fscrypt_bounce_page_pool)
- goto already_initialized;
-
- for (i = 0; i < num_prealloc_crypto_ctxs; i++) {
- struct fscrypt_ctx *ctx;
-
- ctx = kmem_cache_zalloc(fscrypt_ctx_cachep, GFP_NOFS);
- if (!ctx)
- goto fail;
- list_add(&ctx->free_list, &fscrypt_free_ctxs);
- }
+ goto out_unlock;
+ err = -ENOMEM;
fscrypt_bounce_page_pool =
mempool_create_page_pool(num_prealloc_crypto_pages, 0);
if (!fscrypt_bounce_page_pool)
- goto fail;
+ goto out_unlock;
-already_initialized:
- mutex_unlock(&fscrypt_init_mutex);
- return 0;
-fail:
- fscrypt_destroy();
+ err = 0;
+out_unlock:
mutex_unlock(&fscrypt_init_mutex);
- return res;
+ return err;
}
void fscrypt_msg(const struct inode *inode, const char *level,
@@ -490,13 +404,9 @@ static int __init fscrypt_init(void)
if (!fscrypt_read_workqueue)
goto fail;
- fscrypt_ctx_cachep = KMEM_CACHE(fscrypt_ctx, SLAB_RECLAIM_ACCOUNT);
- if (!fscrypt_ctx_cachep)
- goto fail_free_queue;
-
fscrypt_info_cachep = KMEM_CACHE(fscrypt_info, SLAB_RECLAIM_ACCOUNT);
if (!fscrypt_info_cachep)
- goto fail_free_ctx;
+ goto fail_free_queue;
err = fscrypt_init_keyring();
if (err)
@@ -506,8 +416,6 @@ static int __init fscrypt_init(void)
fail_free_info:
kmem_cache_destroy(fscrypt_info_cachep);
-fail_free_ctx:
- kmem_cache_destroy(fscrypt_ctx_cachep);
fail_free_queue:
destroy_workqueue(fscrypt_read_workqueue);
fail: