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authorTyler Hicks <tyhicks@linux.vnet.ibm.com>2009-09-16 19:04:20 -0500
committerTyler Hicks <tyhicks@linux.vnet.ibm.com>2009-09-23 09:10:34 -0500
commit96a7b9c2f5df899f302ade45cf17ad753fe130fd (patch)
tree096b67dbaad8e795344554994e28433a1e5b5de1 /fs/ecryptfs/read_write.c
parent3891959846709a19f76628e33478cd85edb0e79f (diff)
eCryptfs: Propagate vfs_read and vfs_write return codes
Errors returned from vfs_read() and vfs_write() calls to the lower filesystem were being masked as -EINVAL. This caused some confusion to users who saw EINVAL instead of ENOSPC when the disk was full, for instance. Also, the actual bytes read or written were not accessible by callers to ecryptfs_read_lower() and ecryptfs_write_lower(), which may be useful in some cases. This patch updates the error handling logic where those functions are called in order to accept positive return codes indicating success. Cc: Eric Sandeen <esandeen@redhat.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Cc: ecryptfs-devel@lists.launchpad.net Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Diffstat (limited to 'fs/ecryptfs/read_write.c')
-rw-r--r--fs/ecryptfs/read_write.c32
1 files changed, 12 insertions, 20 deletions
diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c
index a137c6ea2fee..0cc4fafd6552 100644
--- a/fs/ecryptfs/read_write.c
+++ b/fs/ecryptfs/read_write.c
@@ -34,15 +34,14 @@
*
* Write data to the lower file.
*
- * Returns zero on success; non-zero on error
+ * Returns bytes written on success; less than zero on error
*/
int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
loff_t offset, size_t size)
{
struct ecryptfs_inode_info *inode_info;
- ssize_t octets_written;
mm_segment_t fs_save;
- int rc = 0;
+ ssize_t rc;
inode_info = ecryptfs_inode_to_private(ecryptfs_inode);
mutex_lock(&inode_info->lower_file_mutex);
@@ -50,14 +49,9 @@ int ecryptfs_write_lower(struct inode *ecryptfs_inode, char *data,
inode_info->lower_file->f_pos = offset;
fs_save = get_fs();
set_fs(get_ds());
- octets_written = vfs_write(inode_info->lower_file, data, size,
- &inode_info->lower_file->f_pos);
+ rc = vfs_write(inode_info->lower_file, data, size,
+ &inode_info->lower_file->f_pos);
set_fs(fs_save);
- if (octets_written < 0) {
- printk(KERN_ERR "%s: octets_written = [%td]; "
- "expected [%td]\n", __func__, octets_written, size);
- rc = -EINVAL;
- }
mutex_unlock(&inode_info->lower_file_mutex);
mark_inode_dirty_sync(ecryptfs_inode);
return rc;
@@ -91,6 +85,8 @@ int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
+ offset_in_page);
virt = kmap(page_for_lower);
rc = ecryptfs_write_lower(ecryptfs_inode, virt, offset, size);
+ if (rc > 0)
+ rc = 0;
kunmap(page_for_lower);
return rc;
}
@@ -229,30 +225,24 @@ out:
* Read @size bytes of data at byte offset @offset from the lower
* inode into memory location @data.
*
- * Returns zero on success; non-zero on error
+ * Returns bytes read on success; 0 on EOF; less than zero on error
*/
int ecryptfs_read_lower(char *data, loff_t offset, size_t size,
struct inode *ecryptfs_inode)
{
struct ecryptfs_inode_info *inode_info =
ecryptfs_inode_to_private(ecryptfs_inode);
- ssize_t octets_read;
mm_segment_t fs_save;
- int rc = 0;
+ ssize_t rc;
mutex_lock(&inode_info->lower_file_mutex);
BUG_ON(!inode_info->lower_file);
inode_info->lower_file->f_pos = offset;
fs_save = get_fs();
set_fs(get_ds());
- octets_read = vfs_read(inode_info->lower_file, data, size,
- &inode_info->lower_file->f_pos);
+ rc = vfs_read(inode_info->lower_file, data, size,
+ &inode_info->lower_file->f_pos);
set_fs(fs_save);
- if (octets_read < 0) {
- printk(KERN_ERR "%s: octets_read = [%td]; "
- "expected [%td]\n", __func__, octets_read, size);
- rc = -EINVAL;
- }
mutex_unlock(&inode_info->lower_file_mutex);
return rc;
}
@@ -284,6 +274,8 @@ int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
offset = ((((loff_t)page_index) << PAGE_CACHE_SHIFT) + offset_in_page);
virt = kmap(page_for_ecryptfs);
rc = ecryptfs_read_lower(virt, offset, size, ecryptfs_inode);
+ if (rc > 0)
+ rc = 0;
kunmap(page_for_ecryptfs);
flush_dcache_page(page_for_ecryptfs);
return rc;