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Add support for FUSE_CANONICAL_PATH

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This allows inotify requests on FUSE to be alerted when any
other stacked filesystem would trigger an inotify for the
same file.

Bug: 23904372
Change-Id: I4289b38230c314432eaf2c0d20d4ccefc058f59e
This commit is contained in:
Daniel Rosenberg 2016-04-19 18:33:08 -07:00
parent 595efd04db
commit 2abee9e063
1 changed files with 36 additions and 0 deletions
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36
sdcard/sdcard.c
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@ -48,6 +48,9 @@
#include <private/android_filesystem_config.h>
/* FUSE_CANONICAL_PATH is not currently upstreamed */
#define FUSE_CANONICAL_PATH 2016
/* README
*
* What is this?
@ -1471,6 +1474,35 @@ static int handle_init(struct fuse* fuse, struct fuse_handler* handler,
return NO_STATUS;
}
static int handle_canonical_path(struct fuse* fuse, struct fuse_handler* handler,
const struct fuse_in_header *hdr)
{
struct node* node;
char path[PATH_MAX];
int len;
pthread_mutex_lock(&fuse->global->lock);
node = lookup_node_and_path_by_id_locked(fuse, hdr->nodeid,
path, sizeof(path));
TRACE("[%d] CANONICAL_PATH @ %" PRIx64 " (%s)\n", handler->token, hdr->nodeid,
node ? node->name : "?");
pthread_mutex_unlock(&fuse->global->lock);
if (!node) {
return -ENOENT;
}
if (!check_caller_access_to_node(fuse, hdr, node, R_OK)) {
return -EACCES;
}
len = strlen(path);
if (len + 1 > PATH_MAX)
len = PATH_MAX - 1;
path[PATH_MAX - 1] = 0;
fuse_reply(fuse, hdr->unique, path, len + 1);
return NO_STATUS;
}
static int handle_fuse_request(struct fuse *fuse, struct fuse_handler* handler,
const struct fuse_in_header *hdr, const void *data, size_t data_len)
{
@ -1586,6 +1618,10 @@ static int handle_fuse_request(struct fuse *fuse, struct fuse_handler* handler,
return handle_init(fuse, handler, hdr, req);
}
case FUSE_CANONICAL_PATH: { /* nodeid -> bytez[] */
return handle_canonical_path(fuse, handler, hdr);
}
default: {
TRACE("[%d] NOTIMPL op=%d uniq=%"PRIx64" nid=%"PRIx64"\n",
handler->token, hdr->opcode, hdr->unique, hdr->nodeid);