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author | Michael Halcrow <mhalcrow@us.ibm.com> | 2007-02-12 00:53:48 -0800 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-12 09:48:37 -0800 |
commit | 9d8b8ce5561890464c54645cdea4d6b157159fec (patch) | |
tree | 94e7f2cdd3a392806ba7b35e5d2722024ddf4098 /fs | |
parent | 70456600f42f85cfcbdd9d7a6029c03b6f9c5d1e (diff) | |
download | linux-9d8b8ce5561890464c54645cdea4d6b157159fec.tar.gz linux-9d8b8ce5561890464c54645cdea4d6b157159fec.tar.bz2 linux-9d8b8ce5561890464c54645cdea4d6b157159fec.zip |
[PATCH] eCryptfs: convert kmap() to kmap_atomic()
Replace kmap() with kmap_atomic(). Reduce the amount of time that mappings
are held.
Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Trevor Highland <tshighla@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/ecryptfs/crypto.c | 8 | ||||
-rw-r--r-- | fs/ecryptfs/ecryptfs_kernel.h | 4 | ||||
-rw-r--r-- | fs/ecryptfs/mmap.c | 121 |
3 files changed, 39 insertions, 94 deletions
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c index 2d7db61b9d6c..b817a1a39e70 100644 --- a/fs/ecryptfs/crypto.c +++ b/fs/ecryptfs/crypto.c @@ -429,10 +429,10 @@ static int ecryptfs_read_in_page(struct ecryptfs_page_crypt_context *ctx, goto out; } } else { - rc = ecryptfs_grab_and_map_lower_page(lower_page, NULL, - lower_inode, - lower_page_idx); - if (rc) { + *lower_page = grab_cache_page(lower_inode->i_mapping, + lower_page_idx); + if (!(*lower_page)) { + rc = -EINVAL; ecryptfs_printk( KERN_ERR, "Error attempting to grab and map " "lower page with index [0x%.16x]; rc = [%d]\n", diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h index ec526df4235e..31e628a3a1fa 100644 --- a/fs/ecryptfs/ecryptfs_kernel.h +++ b/fs/ecryptfs/ecryptfs_kernel.h @@ -514,10 +514,6 @@ int ecryptfs_copy_page_to_lower(struct page *page, struct inode *lower_inode, struct file *lower_file); int ecryptfs_do_readpage(struct file *file, struct page *page, pgoff_t lower_page_index); -int ecryptfs_grab_and_map_lower_page(struct page **lower_page, - char **lower_virt, - struct inode *lower_inode, - unsigned long lower_page_index); int ecryptfs_writepage_and_release_lower_page(struct page *lower_page, struct inode *lower_inode, struct writeback_control *wbc); diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c index 3386014becc6..f5f962d7a123 100644 --- a/fs/ecryptfs/mmap.c +++ b/fs/ecryptfs/mmap.c @@ -234,22 +234,11 @@ int ecryptfs_do_readpage(struct file *file, struct page *page, goto out; } wait_on_page_locked(lower_page); - page_data = (char *)kmap(page); - if (!page_data) { - rc = -ENOMEM; - ecryptfs_printk(KERN_ERR, "Error mapping page\n"); - goto out; - } - lower_page_data = (char *)kmap(lower_page); - if (!lower_page_data) { - rc = -ENOMEM; - ecryptfs_printk(KERN_ERR, "Error mapping page\n"); - kunmap(page); - goto out; - } + page_data = kmap_atomic(page, KM_USER0); + lower_page_data = kmap_atomic(lower_page, KM_USER1); memcpy(page_data, lower_page_data, PAGE_CACHE_SIZE); - kunmap(lower_page); - kunmap(page); + kunmap_atomic(lower_page_data, KM_USER1); + kunmap_atomic(page_data, KM_USER0); rc = 0; out: if (likely(lower_page)) @@ -325,19 +314,14 @@ static int ecryptfs_readpage(struct file *file, struct page *page) if (page->index < num_pages_in_header_region) { char *page_virt; - page_virt = (char *)kmap(page); - if (!page_virt) { - rc = -ENOMEM; - printk(KERN_ERR "Error mapping page\n"); - goto out; - } + page_virt = kmap_atomic(page, KM_USER0); memset(page_virt, 0, PAGE_CACHE_SIZE); if (page->index == 0) { rc = ecryptfs_read_xattr_region( page_virt, file->f_path.dentry); set_header_info(page_virt, crypt_stat); } - kunmap(page); + kunmap_atomic(page_virt, KM_USER0); if (rc) { printk(KERN_ERR "Error reading xattr " "region\n"); @@ -387,26 +371,19 @@ static int fill_zeros_to_end_of_page(struct page *page, unsigned int to) { struct inode *inode = page->mapping->host; int end_byte_in_page; - int rc = 0; char *page_virt; - if ((i_size_read(inode) / PAGE_CACHE_SIZE) == page->index) { - end_byte_in_page = i_size_read(inode) % PAGE_CACHE_SIZE; - if (to > end_byte_in_page) - end_byte_in_page = to; - page_virt = kmap(page); - if (!page_virt) { - rc = -ENOMEM; - ecryptfs_printk(KERN_WARNING, - "Could not map page\n"); - goto out; - } - memset((page_virt + end_byte_in_page), 0, - (PAGE_CACHE_SIZE - end_byte_in_page)); - kunmap(page); - } + if ((i_size_read(inode) / PAGE_CACHE_SIZE) != page->index) + goto out; + end_byte_in_page = i_size_read(inode) % PAGE_CACHE_SIZE; + if (to > end_byte_in_page) + end_byte_in_page = to; + page_virt = kmap_atomic(page, KM_USER0); + memset((page_virt + end_byte_in_page), 0, + (PAGE_CACHE_SIZE - end_byte_in_page)); + kunmap_atomic(page_virt, KM_USER0); out: - return rc; + return 0; } static int ecryptfs_prepare_write(struct file *file, struct page *page, @@ -414,7 +391,6 @@ static int ecryptfs_prepare_write(struct file *file, struct page *page, { int rc = 0; - kmap(page); if (from == 0 && to == PAGE_CACHE_SIZE) goto out; /* If we are writing a full page, it will be up to date. */ @@ -424,30 +400,6 @@ out: return rc; } -int ecryptfs_grab_and_map_lower_page(struct page **lower_page, - char **lower_virt, - struct inode *lower_inode, - unsigned long lower_page_index) -{ - int rc = 0; - - (*lower_page) = grab_cache_page(lower_inode->i_mapping, - lower_page_index); - if (!(*lower_page)) { - ecryptfs_printk(KERN_ERR, "grab_cache_page for " - "lower_page_index = [0x%.16x] failed\n", - lower_page_index); - rc = -EINVAL; - goto out; - } - if (lower_virt) - (*lower_virt) = kmap((*lower_page)); - else - kmap((*lower_page)); -out: - return rc; -} - int ecryptfs_writepage_and_release_lower_page(struct page *lower_page, struct inode *lower_inode, struct writeback_control *wbc) @@ -466,11 +418,8 @@ out: return rc; } -static void ecryptfs_unmap_and_release_lower_page(struct page *lower_page) +static void ecryptfs_release_lower_page(struct page *lower_page) { - kunmap(lower_page); - ecryptfs_printk(KERN_DEBUG, "Unlocking lower page with index = " - "[0x%.16x]\n", lower_page->index); unlock_page(lower_page); page_cache_release(lower_page); } @@ -492,11 +441,11 @@ static int ecryptfs_write_inode_size_to_header(struct file *lower_file, const struct address_space_operations *lower_a_ops; u64 file_size; - rc = ecryptfs_grab_and_map_lower_page(&header_page, &header_virt, - lower_inode, 0); - if (rc) { - ecryptfs_printk(KERN_ERR, "grab_cache_page for header page " - "failed\n"); + header_page = grab_cache_page(lower_inode->i_mapping, 0); + if (!header_page) { + ecryptfs_printk(KERN_ERR, "grab_cache_page for " + "lower_page_index 0 failed\n"); + rc = -EINVAL; goto out; } lower_a_ops = lower_inode->i_mapping->a_ops; @@ -504,12 +453,14 @@ static int ecryptfs_write_inode_size_to_header(struct file *lower_file, file_size = (u64)i_size_read(inode); ecryptfs_printk(KERN_DEBUG, "Writing size: [0x%.16x]\n", file_size); file_size = cpu_to_be64(file_size); + header_virt = kmap_atomic(header_page, KM_USER0); memcpy(header_virt, &file_size, sizeof(u64)); + kunmap_atomic(header_virt, KM_USER0); rc = lower_a_ops->commit_write(lower_file, header_page, 0, 8); if (rc < 0) ecryptfs_printk(KERN_ERR, "Error commiting header page " "write\n"); - ecryptfs_unmap_and_release_lower_page(header_page); + ecryptfs_release_lower_page(header_page); lower_inode->i_mtime = lower_inode->i_ctime = CURRENT_TIME; mark_inode_dirty_sync(inode); out: @@ -597,10 +548,10 @@ int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode, { int rc = 0; - rc = ecryptfs_grab_and_map_lower_page(lower_page, NULL, lower_inode, - lower_page_index); - if (rc) { - ecryptfs_printk(KERN_ERR, "Error attempting to grab and map " + *lower_page = grab_cache_page(lower_inode->i_mapping, lower_page_index); + if (!(*lower_page)) { + rc = -EINVAL; + ecryptfs_printk(KERN_ERR, "Error attempting to grab " "lower page with index [0x%.16x]\n", lower_page_index); goto out; @@ -616,7 +567,7 @@ int ecryptfs_get_lower_page(struct page **lower_page, struct inode *lower_inode, } out: if (rc && (*lower_page)) { - ecryptfs_unmap_and_release_lower_page(*lower_page); + ecryptfs_release_lower_page(*lower_page); (*lower_page) = NULL; } return rc; @@ -641,7 +592,7 @@ ecryptfs_commit_lower_page(struct page *lower_page, struct inode *lower_inode, "Error committing write; rc = [%d]\n", rc); } else rc = 0; - ecryptfs_unmap_and_release_lower_page(lower_page); + ecryptfs_release_lower_page(lower_page); return rc; } @@ -747,7 +698,6 @@ static int ecryptfs_commit_write(struct file *file, struct page *page, lower_inode->i_mtime = lower_inode->i_ctime = CURRENT_TIME; mark_inode_dirty_sync(inode); out: - kunmap(page); /* mapped in prior call (prepare_write) */ if (rc < 0) ClearPageUptodate(page); else @@ -772,6 +722,7 @@ int write_zeros(struct file *file, pgoff_t index, int start, int num_zeros) { int rc = 0; struct page *tmp_page; + char *tmp_page_virt; tmp_page = ecryptfs_get1page(file, index); if (IS_ERR(tmp_page)) { @@ -780,28 +731,26 @@ int write_zeros(struct file *file, pgoff_t index, int start, int num_zeros) rc = PTR_ERR(tmp_page); goto out; } - kmap(tmp_page); rc = ecryptfs_prepare_write(file, tmp_page, start, start + num_zeros); if (rc) { ecryptfs_printk(KERN_ERR, "Error preparing to write zero's " "to remainder of page at index [0x%.16x]\n", index); - kunmap(tmp_page); page_cache_release(tmp_page); goto out; } - memset(((char *)page_address(tmp_page) + start), 0, num_zeros); + tmp_page_virt = kmap_atomic(tmp_page, KM_USER0); + memset(((char *)tmp_page_virt + start), 0, num_zeros); + kunmap_atomic(tmp_page_virt, KM_USER0); rc = ecryptfs_commit_write(file, tmp_page, start, start + num_zeros); if (rc < 0) { ecryptfs_printk(KERN_ERR, "Error attempting to write zero's " "to remainder of page at index [0x%.16x]\n", index); - kunmap(tmp_page); page_cache_release(tmp_page); goto out; } rc = 0; - kunmap(tmp_page); page_cache_release(tmp_page); out: return rc; |