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Commit 2abee9e0 authored by Daniel Rosenberg's avatar Daniel Rosenberg
Browse files

Add support for FUSE_CANONICAL_PATH 

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
parent 595efd04

sdcard/sdcard.c

+36 −0
Original line number Diff line number Diff line
@@ -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);