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ANDROID: Incremental fs: Fix incfs to work on virtio-9p

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Test: incfs_test on a virtio 9p drive. Note test 6 fails still,
but I think this is a result of caching directory entries over a
network file system.
Bug: 161802292
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Change-Id: I6986fb3e9b403181cf81024046f394960caf4620
This commit is contained in:
Paul Lawrence 2020-07-20 13:20:02 -07:00
parent 3db1212938
commit b59b963a7d
2 changed files with 38 additions and 15 deletions
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47
fs/incfs/format.c
View File

@ -89,11 +89,42 @@ static int truncate_backing_file(struct backing_file_context *bfc,
return result;
}
static int write_to_bf(struct backing_file_context *bfc, const void *buf,
size_t count, loff_t pos)
{
ssize_t res = incfs_kwrite(bfc->bc_file, buf, count, pos);
if (res < 0)
return res;
if (res != count)
return -EIO;
return 0;
}
static int append_zeros_no_fallocate(struct backing_file_context *bfc,
size_t file_size, size_t len)
{
u8 buffer[256] = {};
size_t i;
for (i = 0; i < len; i += sizeof(buffer)) {
int to_write = len - i > sizeof(buffer)
? sizeof(buffer) : len - i;
int err = write_to_bf(bfc, buffer, to_write, file_size + i);
if (err)
return err;
}
return 0;
}
/* Append a given number of zero bytes to the end of the backing file. */
static int append_zeros(struct backing_file_context *bfc, size_t len)
{
loff_t file_size = 0;
loff_t new_last_byte_offset = 0;
int result;
if (!bfc)
return -EFAULT;
@ -110,19 +141,11 @@ static int append_zeros(struct backing_file_context *bfc, size_t len)
*/
file_size = incfs_get_end_offset(bfc->bc_file);
new_last_byte_offset = file_size + len - 1;
return vfs_fallocate(bfc->bc_file, 0, new_last_byte_offset, 1);
}
result = vfs_fallocate(bfc->bc_file, 0, new_last_byte_offset, 1);
if (result != -EOPNOTSUPP)
return result;
static int write_to_bf(struct backing_file_context *bfc, const void *buf,
size_t count, loff_t pos)
{
ssize_t res = incfs_kwrite(bfc->bc_file, buf, count, pos);
if (res < 0)
return res;
if (res != count)
return -EIO;
return 0;
return append_zeros_no_fallocate(bfc, file_size, len);
}
static u32 calc_md_crc(struct incfs_md_header *record)

6
fs/incfs/vfs.c
View File

@ -1931,17 +1931,17 @@ static int file_open(struct inode *inode, struct file *file)
struct file *backing_file = NULL;
struct path backing_path = {};
int err = 0;
int flags = O_NOATIME | O_LARGEFILE |
(S_ISDIR(inode->i_mode) ? O_RDONLY : O_RDWR);
if (!mi)
return -EBADF;
get_incfs_backing_path(file->f_path.dentry, &backing_path);
if (!backing_path.dentry)
return -EBADF;
backing_file = dentry_open(
&backing_path, O_RDWR | O_NOATIME | O_LARGEFILE, mi->mi_owner);
backing_file = dentry_open(&backing_path, flags, mi->mi_owner);
path_put(&backing_path);
if (IS_ERR(backing_file)) {