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fanotify: break up fanotify_alloc_event() 

Break up fanotify_alloc_event() into helpers by event struct type.

Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein 2020-03-30 10:55:28 +03:00 committed by Jan Kara
parent b8a6c3a2f0
commit 9c61f3b560
1 changed files with 89 additions and 65 deletions
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154
fs/notify/fanotify/fanotify.c
View File

@ -344,15 +344,84 @@ static struct inode *fanotify_fid_inode(struct inode *to_tell, u32 event_mask,
return fsnotify_data_inode(data, data_type);
}
static struct fanotify_event *fanotify_alloc_path_event(const struct path *path,
gfp_t gfp)
{
struct fanotify_path_event *pevent;
pevent = kmem_cache_alloc(fanotify_path_event_cachep, gfp);
if (!pevent)
return NULL;
pevent->fae.type = FANOTIFY_EVENT_TYPE_PATH;
pevent->path = *path;
path_get(path);
return &pevent->fae;
}
static struct fanotify_event *fanotify_alloc_perm_event(const struct path *path,
gfp_t gfp)
{
struct fanotify_perm_event *pevent;
pevent = kmem_cache_alloc(fanotify_perm_event_cachep, gfp);
if (!pevent)
return NULL;
pevent->fae.type = FANOTIFY_EVENT_TYPE_PATH_PERM;
pevent->response = 0;
pevent->state = FAN_EVENT_INIT;
pevent->path = *path;
path_get(path);
return &pevent->fae;
}
static struct fanotify_event *fanotify_alloc_fid_event(struct inode *id,
__kernel_fsid_t *fsid,
gfp_t gfp)
{
struct fanotify_fid_event *ffe;
ffe = kmem_cache_alloc(fanotify_fid_event_cachep, gfp);
if (!ffe)
return NULL;
ffe->fae.type = FANOTIFY_EVENT_TYPE_FID;
ffe->fsid = *fsid;
fanotify_encode_fh(&ffe->object_fh, id, gfp);
return &ffe->fae;
}
static struct fanotify_event *fanotify_alloc_name_event(struct inode *id,
__kernel_fsid_t *fsid,
const struct qstr *file_name,
gfp_t gfp)
{
struct fanotify_name_event *fne;
fne = kmalloc(sizeof(*fne) + file_name->len + 1, gfp);
if (!fne)
return NULL;
fne->fae.type = FANOTIFY_EVENT_TYPE_FID_NAME;
fne->fsid = *fsid;
fanotify_encode_fh(&fne->dir_fh, id, gfp);
fne->name_len = file_name->len;
strcpy(fne->name, file_name->name);
return &fne->fae;
}
static struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
struct inode *inode, u32 mask,
const void *data, int data_type,
const struct qstr *file_name,
__kernel_fsid_t *fsid)
struct inode *inode, u32 mask,
const void *data, int data_type,
const struct qstr *file_name,
__kernel_fsid_t *fsid)
{
struct fanotify_event *event = NULL;
struct fanotify_fid_event *ffe = NULL;
struct fanotify_name_event *fne = NULL;
gfp_t gfp = GFP_KERNEL_ACCOUNT;
struct inode *id = fanotify_fid_inode(inode, mask, data, data_type);
const struct path *path = fsnotify_data_path(data, data_type);
@ -372,55 +441,23 @@ static struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
memalloc_use_memcg(group->memcg);
if (fanotify_is_perm_event(mask)) {
struct fanotify_perm_event *pevent;
pevent = kmem_cache_alloc(fanotify_perm_event_cachep, gfp);
if (!pevent)
goto out;
event = &pevent->fae;
event->type = FANOTIFY_EVENT_TYPE_PATH_PERM;
pevent->response = 0;
pevent->state = FAN_EVENT_INIT;
goto init;
}
/*
* For FAN_DIR_MODIFY event, we report the fid of the directory and
* the name of the modified entry.
* Allocate an fanotify_name_event struct and copy the name.
*/
if (mask & FAN_DIR_MODIFY && !(WARN_ON_ONCE(!file_name))) {
fne = kmalloc(sizeof(*fne) + file_name->len + 1, gfp);
if (!fne)
goto out;
event = &fne->fae;
event->type = FANOTIFY_EVENT_TYPE_FID_NAME;
fne->name_len = file_name->len;
strcpy(fne->name, file_name->name);
goto init;
}
if (FAN_GROUP_FLAG(group, FAN_REPORT_FID)) {
ffe = kmem_cache_alloc(fanotify_fid_event_cachep, gfp);
if (!ffe)
goto out;
event = &ffe->fae;
event->type = FANOTIFY_EVENT_TYPE_FID;
event = fanotify_alloc_perm_event(path, gfp);
} else if (mask & FAN_DIR_MODIFY && !(WARN_ON_ONCE(!file_name))) {
/*
* For FAN_DIR_MODIFY event, we report the fid of the directory
* and the name of the modified entry.
* Allocate an fanotify_name_event struct and copy the name.
*/
event = fanotify_alloc_name_event(id, fsid, file_name, gfp);
} else if (FAN_GROUP_FLAG(group, FAN_REPORT_FID)) {
event = fanotify_alloc_fid_event(id, fsid, gfp);
} else {
struct fanotify_path_event *pevent;
pevent = kmem_cache_alloc(fanotify_path_event_cachep, gfp);
if (!pevent)
goto out;
event = &pevent->fae;
event->type = FANOTIFY_EVENT_TYPE_PATH;
event = fanotify_alloc_path_event(path, gfp);
}
init:
if (!event)
goto out;
/*
* Use the victim inode instead of the watching inode as the id for
* event queue, so event reported on parent is merged with event
@ -432,19 +469,6 @@ init:
else
event->pid = get_pid(task_tgid(current));
if (fsid && fanotify_event_fsid(event))
*fanotify_event_fsid(event) = *fsid;
if (fanotify_event_object_fh(event))
fanotify_encode_fh(fanotify_event_object_fh(event), id, gfp);
if (fanotify_event_dir_fh(event))
fanotify_encode_fh(fanotify_event_dir_fh(event), id, gfp);
if (fanotify_event_has_path(event)) {
*fanotify_event_path(event) = *path;
path_get(path);
}
out:
memalloc_unuse_memcg();
return event;