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-rw-r--r--fs/ecryptfs/crypto.c12
-rw-r--r--fs/ecryptfs/ecryptfs_kernel.h2
-rw-r--r--fs/ecryptfs/mmap.c28
-rw-r--r--fs/ecryptfs/read_write.c30
4 files changed, 39 insertions, 33 deletions
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index e890d596da7e..1ae90ef2c74d 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -605,14 +605,14 @@ int ecryptfs_decrypt_page(struct page *page)
printk(KERN_ERR "%s: Error attempting to copy "
"page at index [%ld]\n", __FUNCTION__,
page->index);
- goto out_clear_uptodate;
+ goto out;
}
enc_extent_virt = kmalloc(PAGE_CACHE_SIZE, GFP_USER);
if (!enc_extent_virt) {
rc = -ENOMEM;
ecryptfs_printk(KERN_ERR, "Error allocating memory for "
"encrypted extent\n");
- goto out_clear_uptodate;
+ goto out;
}
enc_extent_page = virt_to_page(enc_extent_virt);
for (extent_offset = 0;
@@ -631,21 +631,17 @@ int ecryptfs_decrypt_page(struct page *page)
ecryptfs_printk(KERN_ERR, "Error attempting "
"to read lower page; rc = [%d]"
"\n", rc);
- goto out_clear_uptodate;
+ goto out;
}
rc = ecryptfs_decrypt_extent(page, crypt_stat, enc_extent_page,
extent_offset);
if (rc) {
printk(KERN_ERR "%s: Error encrypting extent; "
"rc = [%d]\n", __FUNCTION__, rc);
- goto out_clear_uptodate;
+ goto out;
}
extent_offset++;
}
- SetPageUptodate(page);
- goto out;
-out_clear_uptodate:
- ClearPageUptodate(page);
out:
kfree(enc_extent_virt);
return rc;
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index bb92b74d66e9..ce7a5d4aec36 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -648,6 +648,6 @@ int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
struct inode *ecryptfs_inode);
int ecryptfs_read(char *data, loff_t offset, size_t size,
struct file *ecryptfs_file);
-struct page *ecryptfs_get1page(struct file *file, loff_t index);
+struct page *ecryptfs_get_locked_page(struct file *file, loff_t index);
#endif /* #ifndef ECRYPTFS_KERNEL_H */
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 4eb09c1753c6..16a7a555f392 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -37,23 +37,27 @@
struct kmem_cache *ecryptfs_lower_page_cache;
/**
- * ecryptfs_get1page
+ * ecryptfs_get_locked_page
*
* Get one page from cache or lower f/s, return error otherwise.
*
- * Returns unlocked and up-to-date page (if ok), with increased
+ * Returns locked and up-to-date page (if ok), with increased
* refcnt.
*/
-struct page *ecryptfs_get1page(struct file *file, loff_t index)
+struct page *ecryptfs_get_locked_page(struct file *file, loff_t index)
{
struct dentry *dentry;
struct inode *inode;
struct address_space *mapping;
+ struct page *page;
dentry = file->f_path.dentry;
inode = dentry->d_inode;
mapping = inode->i_mapping;
- return read_mapping_page(mapping, index, (void *)file);
+ page = read_mapping_page(mapping, index, (void *)file);
+ if (!IS_ERR(page))
+ lock_page(page);
+ return page;
}
/**
@@ -146,12 +150,10 @@ ecryptfs_copy_up_encrypted_with_header(struct page *page,
kunmap_atomic(page_virt, KM_USER0);
flush_dcache_page(page);
if (rc) {
- ClearPageUptodate(page);
printk(KERN_ERR "%s: Error reading xattr "
"region; rc = [%d]\n", __FUNCTION__, rc);
goto out;
}
- SetPageUptodate(page);
} else {
/* This is an encrypted data extent */
loff_t lower_offset =
@@ -232,6 +234,10 @@ static int ecryptfs_readpage(struct file *file, struct page *page)
}
}
out:
+ if (rc)
+ ClearPageUptodate(page);
+ else
+ SetPageUptodate(page);
ecryptfs_printk(KERN_DEBUG, "Unlocking page with index = [0x%.16x]\n",
page->index);
unlock_page(page);
@@ -265,10 +271,18 @@ static int ecryptfs_prepare_write(struct file *file, struct page *page,
if (from == 0 && to == PAGE_CACHE_SIZE)
goto out; /* If we are writing a full page, it will be
up to date. */
- if (!PageUptodate(page))
+ if (!PageUptodate(page)) {
rc = ecryptfs_read_lower_page_segment(page, page->index, 0,
PAGE_CACHE_SIZE,
page->mapping->host);
+ if (rc) {
+ printk(KERN_ERR "%s: Error attemping to read lower "
+ "page segment; rc = [%d]\n", __FUNCTION__, rc);
+ ClearPageUptodate(page);
+ goto out;
+ } else
+ SetPageUptodate(page);
+ }
if (page->index != 0) {
loff_t end_of_prev_pg_pos =
(((loff_t)page->index << PAGE_CACHE_SHIFT) - 1);
diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c
index 272eaeb9a738..2150edf9a58e 100644
--- a/fs/ecryptfs/read_write.c
+++ b/fs/ecryptfs/read_write.c
@@ -142,8 +142,8 @@ int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
if (num_bytes > total_remaining_zeros)
num_bytes = total_remaining_zeros;
}
- ecryptfs_page = ecryptfs_get1page(ecryptfs_file,
- ecryptfs_page_idx);
+ ecryptfs_page = ecryptfs_get_locked_page(ecryptfs_file,
+ ecryptfs_page_idx);
if (IS_ERR(ecryptfs_page)) {
rc = PTR_ERR(ecryptfs_page);
printk(KERN_ERR "%s: Error getting page at "
@@ -161,6 +161,7 @@ int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
printk(KERN_ERR "%s: Error decrypting "
"page; rc = [%d]\n",
__FUNCTION__, rc);
+ ClearPageUptodate(ecryptfs_page);
page_cache_release(ecryptfs_page);
goto out;
}
@@ -180,14 +181,15 @@ int ecryptfs_write(struct file *ecryptfs_file, char *data, loff_t offset,
}
kunmap_atomic(ecryptfs_page_virt, KM_USER0);
flush_dcache_page(ecryptfs_page);
+ SetPageUptodate(ecryptfs_page);
+ unlock_page(ecryptfs_page);
rc = ecryptfs_encrypt_page(ecryptfs_page);
+ page_cache_release(ecryptfs_page);
if (rc) {
printk(KERN_ERR "%s: Error encrypting "
"page; rc = [%d]\n", __FUNCTION__, rc);
- page_cache_release(ecryptfs_page);
goto out;
}
- page_cache_release(ecryptfs_page);
pos += num_bytes;
}
if ((offset + size) > ecryptfs_file_size) {
@@ -225,7 +227,6 @@ int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
ecryptfs_inode_to_private(ecryptfs_inode);
ssize_t octets_read;
mm_segment_t fs_save;
- size_t i;
int rc = 0;
mutex_lock(&inode_info->lower_file_mutex);
@@ -242,16 +243,6 @@ int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
rc = -EINVAL;
}
mutex_unlock(&inode_info->lower_file_mutex);
- for (i = 0; i < size; i += PAGE_CACHE_SIZE) {
- struct page *data_page;
-
- data_page = virt_to_page(data + i);
- flush_dcache_page(data_page);
- if (rc)
- ClearPageUptodate(data_page);
- else
- SetPageUptodate(data_page);
- }
return rc;
}
@@ -283,6 +274,7 @@ int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
virt = kmap(page_for_ecryptfs);
rc = ecryptfs_read_lower(virt, offset, size, ecryptfs_inode);
kunmap(page_for_ecryptfs);
+ flush_dcache_page(page_for_ecryptfs);
return rc;
}
@@ -331,8 +323,8 @@ int ecryptfs_read(char *data, loff_t offset, size_t size,
if (num_bytes > total_remaining_bytes)
num_bytes = total_remaining_bytes;
- ecryptfs_page = ecryptfs_get1page(ecryptfs_file,
- ecryptfs_page_idx);
+ ecryptfs_page = ecryptfs_get_locked_page(ecryptfs_file,
+ ecryptfs_page_idx);
if (IS_ERR(ecryptfs_page)) {
rc = PTR_ERR(ecryptfs_page);
printk(KERN_ERR "%s: Error getting page at "
@@ -345,6 +337,7 @@ int ecryptfs_read(char *data, loff_t offset, size_t size,
if (rc) {
printk(KERN_ERR "%s: Error decrypting "
"page; rc = [%d]\n", __FUNCTION__, rc);
+ ClearPageUptodate(ecryptfs_page);
page_cache_release(ecryptfs_page);
goto out;
}
@@ -353,6 +346,9 @@ int ecryptfs_read(char *data, loff_t offset, size_t size,
((char *)ecryptfs_page_virt + start_offset_in_page),
num_bytes);
kunmap_atomic(ecryptfs_page_virt, KM_USER0);
+ flush_dcache_page(ecryptfs_page);
+ SetPageUptodate(ecryptfs_page);
+ unlock_page(ecryptfs_page);
page_cache_release(ecryptfs_page);
pos += num_bytes;
data_offset += num_bytes;
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