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ANDROID: Incremental fs: inotify on create mapped file

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Bug: 175323815
Test: incfs_test passes
Signed-off-by: Paul Lawrence <paullawrence@google.com>
Change-Id: I670e8a7f4a68012d68718a431be3450646a614c0
This commit is contained in:
Paul Lawrence 2021-01-28 07:58:08 -08:00
parent a699d0a2ab
commit 400d6734bb
3 changed files with 51 additions and 27 deletions
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52
fs/incfs/pseudo_files.c
View File

@ -409,27 +409,8 @@ static void notify_create(struct file *pending_reads_file,
fsnotify_create(d_inode(dir_path.dentry), file);
dir = incfs_lookup_dentry(base_path.dentry, INCFS_INDEX_NAME);
if (IS_ERR(dir)) {
error = PTR_ERR(dir);
dir = NULL;
goto out;
}
dput(file);
file = incfs_lookup_dentry(dir, file_id_str);
if (IS_ERR(file)) {
error = PTR_ERR(file);
file = NULL;
goto out;
}
fsnotify_create(d_inode(dir), file);
if (incomplete_file) {
dput(dir);
dir = incfs_lookup_dentry(base_path.dentry,
INCFS_INCOMPLETE_NAME);
if (file_id_str) {
dir = incfs_lookup_dentry(base_path.dentry, INCFS_INDEX_NAME);
if (IS_ERR(dir)) {
error = PTR_ERR(dir);
dir = NULL;
@ -445,6 +426,27 @@ static void notify_create(struct file *pending_reads_file,
}
fsnotify_create(d_inode(dir), file);
if (incomplete_file) {
dput(dir);
dir = incfs_lookup_dentry(base_path.dentry,
INCFS_INCOMPLETE_NAME);
if (IS_ERR(dir)) {
error = PTR_ERR(dir);
dir = NULL;
goto out;
}
dput(file);
file = incfs_lookup_dentry(dir, file_id_str);
if (IS_ERR(file)) {
error = PTR_ERR(file);
file = NULL;
goto out;
}
fsnotify_create(d_inode(dir), file);
}
}
out:
if (error)
@ -744,8 +746,9 @@ static int init_new_mapped_file(struct mount_info *mi, struct dentry *dentry,
return error;
}
static long ioctl_create_mapped_file(struct mount_info *mi, void __user *arg)
static long ioctl_create_mapped_file(struct file *file, void __user *arg)
{
struct mount_info *mi = get_mount_info(file_superblock(file));
struct incfs_create_mapped_file_args __user *args_usr_ptr = arg;
struct incfs_create_mapped_file_args args = {};
char *file_name;
@ -874,6 +877,9 @@ static long ioctl_create_mapped_file(struct mount_info *mi, void __user *arg)
if (error)
goto delete_file;
notify_create(file, u64_to_user_ptr(args.directory_path), file_name,
NULL, false);
goto out;
delete_file:
@ -989,7 +995,7 @@ static long pending_reads_dispatch_ioctl(struct file *f, unsigned int req,
case INCFS_IOC_PERMIT_FILL:
return ioctl_permit_fill(f, (void __user *)arg);
case INCFS_IOC_CREATE_MAPPED_FILE:
return ioctl_create_mapped_file(mi, (void __user *)arg);
return ioctl_create_mapped_file(f, (void __user *)arg);
case INCFS_IOC_GET_READ_TIMEOUTS:
return ioctl_get_read_timeouts(mi, (void __user *)arg);
case INCFS_IOC_SET_READ_TIMEOUTS:

7
fs/incfs/vfs.c
View File

@ -624,15 +624,14 @@ static void maybe_delete_incomplete_file(struct file *f,
vfs_fsync(df->df_backing_file_context->bc_file, 0);
error = incfs_unlink(incomplete_file_dentry);
if (error)
if (error) {
pr_warn("incfs: Deleting incomplete file failed: %d\n", error);
goto out;
}
notify_unlink(f->f_path.dentry, file_id_str, INCFS_INCOMPLETE_NAME);
out:
if (error)
pr_warn("incfs: Deleting incomplete file failed: %d\n", error);
dput(incomplete_file_dentry);
kfree(file_id_str);
revert_creds(old_cred);

19
tools/testing/selftests/filesystems/incfs/incfs_test.c
View File

@ -3476,6 +3476,7 @@ static int per_uid_read_timeouts_test(const char *mount_dir)
#define DIRS 3
static int inotify_test(const char *mount_dir)
{
const char *mapped_file_name = "mapped_name";
struct test_file file = {
.name = "file",
.size = 16 * INCFS_DATA_FILE_BLOCK_SIZE
@ -3494,6 +3495,7 @@ static int inotify_test(const char *mount_dir)
const char *names[DIRS] = {};
int res;
char id[sizeof(incfs_uuid_t) * 2 + 1];
struct incfs_create_mapped_file_args mfa;
/* File creation triggers inotify events in .index and .incomplete? */
TEST(backing_dir = create_backing_dir(mount_dir), backing_dir);
@ -3548,6 +3550,23 @@ static int inotify_test(const char *mount_dir)
TESTEQUAL(strcmp(names[1], id), 0);
TESTEQUAL(strcmp(names[2], id), 0);
/* Creating a mapped file triggers inotify event */
mfa = (struct incfs_create_mapped_file_args) {
.size = INCFS_DATA_FILE_BLOCK_SIZE,
.mode = 0664,
.file_name = ptr_to_u64(mapped_file_name),
.source_file_id = file.id,
.source_offset = INCFS_DATA_FILE_BLOCK_SIZE,
};
TEST(res = ioctl(cmd_fd, INCFS_IOC_CREATE_MAPPED_FILE, &mfa),
res != -1);
TEST(res = read(notify_fd, buffer, sizeof(buffer)), res != -1);
event = (struct inotify_event *) buffer;
TESTEQUAL(event->wd, wds[0]);
TESTEQUAL(event->mask, IN_CREATE);
TESTEQUAL(strcmp(event->name, mapped_file_name), 0);
/* File completion triggers inotify event in .incomplete? */
TESTEQUAL(emit_test_file_data(mount_dir, &file), 0);
TEST(res = read(notify_fd, buffer, sizeof(buffer)), res != -1);