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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/crypto.c
parent3891959846709a19f76628e33478cd85edb0e79f (diff)
downloadop-kernel-dev-96a7b9c2f5df899f302ade45cf17ad753fe130fd.zip
op-kernel-dev-96a7b9c2f5df899f302ade45cf17ad753fe130fd.tar.gz
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/crypto.c')
-rw-r--r--fs/ecryptfs/crypto.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index bae20ad..fbb6e5e 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -509,13 +509,14 @@ int ecryptfs_encrypt_page(struct page *page)
+ extent_offset), crypt_stat);
rc = ecryptfs_write_lower(ecryptfs_inode, enc_extent_virt,
offset, crypt_stat->extent_size);
- if (rc) {
+ if (rc < 0) {
ecryptfs_printk(KERN_ERR, "Error attempting "
"to write lower page; rc = [%d]"
"\n", rc);
goto out;
}
}
+ rc = 0;
out:
if (enc_extent_page) {
kunmap(enc_extent_page);
@@ -631,7 +632,7 @@ int ecryptfs_decrypt_page(struct page *page)
rc = ecryptfs_read_lower(enc_extent_virt, offset,
crypt_stat->extent_size,
ecryptfs_inode);
- if (rc) {
+ if (rc < 0) {
ecryptfs_printk(KERN_ERR, "Error attempting "
"to read lower page; rc = [%d]"
"\n", rc);
@@ -1213,14 +1214,15 @@ int ecryptfs_read_and_validate_header_region(char *data,
crypt_stat->extent_size = ECRYPTFS_DEFAULT_EXTENT_SIZE;
rc = ecryptfs_read_lower(data, 0, crypt_stat->extent_size,
ecryptfs_inode);
- if (rc) {
+ if (rc < 0) {
printk(KERN_ERR "%s: Error reading header region; rc = [%d]\n",
__func__, rc);
goto out;
}
if (!contains_ecryptfs_marker(data + ECRYPTFS_FILE_SIZE_BYTES)) {
rc = -EINVAL;
- }
+ } else
+ rc = 0;
out:
return rc;
}
@@ -1315,10 +1317,11 @@ ecryptfs_write_metadata_to_contents(struct dentry *ecryptfs_dentry,
rc = ecryptfs_write_lower(ecryptfs_dentry->d_inode, virt,
0, virt_len);
- if (rc)
+ if (rc < 0)
printk(KERN_ERR "%s: Error attempting to write header "
- "information to lower file; rc = [%d]\n", __func__,
- rc);
+ "information to lower file; rc = [%d]\n", __func__, rc);
+ else
+ rc = 0;
return rc;
}
@@ -1598,7 +1601,7 @@ int ecryptfs_read_metadata(struct dentry *ecryptfs_dentry)
}
rc = ecryptfs_read_lower(page_virt, 0, crypt_stat->extent_size,
ecryptfs_inode);
- if (!rc)
+ if (rc >= 0)
rc = ecryptfs_read_headers_virt(page_virt, crypt_stat,
ecryptfs_dentry,
ECRYPTFS_VALIDATE_HEADER_SIZE);
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