[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v2 09/29] tools/xenlogd: add 9pfs open request support
Add the open request of the 9pfs protocol. Signed-off-by: Juergen Gross <jgross@xxxxxxxx> --- V2: - don't allow to open symbolic link --- tools/xen-9pfsd/io.c | 144 ++++++++++++++++++++++++++++++++++++ tools/xen-9pfsd/xen-9pfsd.h | 4 + 2 files changed, 148 insertions(+) diff --git a/tools/xen-9pfsd/io.c b/tools/xen-9pfsd/io.c index 62c64474e6..bb9c78a1f5 100644 --- a/tools/xen-9pfsd/io.c +++ b/tools/xen-9pfsd/io.c @@ -18,6 +18,8 @@ #include <syslog.h> #include <sys/types.h> #include <sys/stat.h> +#include <dirent.h> +#include <fcntl.h> #include <xenctrl.h> /* For cpu barriers. */ #include <xen-tools/common-macros.h> @@ -28,6 +30,15 @@ #define P9_CMD_ATTACH 104 #define P9_CMD_ERROR 107 #define P9_CMD_WALK 110 +#define P9_CMD_OPEN 112 + +/* P9 protocol open flags. */ +#define P9_OREAD 0 /* read */ +#define P9_OWRITE 1 /* write */ +#define P9_ORDWR 2 /* read and write */ +#define P9_OMODEMASK 0x03 +#define P9_OTRUNC 0x10 /* or'ed in, truncate file first */ +#define P9_OREMOVE 0x40 /* or'ed in, remove file after clunk */ #define P9_MIN_MSIZE 2048 #define P9_VERSION "9P2000.u" @@ -803,6 +814,135 @@ static void p9_walk(struct ring *ring, struct p9_header *hdr) free(names); } +static int open_flags_from_mode(uint8_t mode) +{ + int flags; + + switch ( mode & P9_OMODEMASK ) + { + case P9_OREAD: + flags = O_RDONLY; + break; + + case P9_OWRITE: + flags = O_WRONLY; + break; + + case P9_ORDWR: + flags = O_RDWR; + break; + + default: + return -1; + } + + if ( mode & P9_OTRUNC ) + flags |= O_TRUNC; + + return flags; +} + +static unsigned int get_iounit(struct ring *ring, struct stat *st) +{ + return (ring->max_size - st->st_blksize) & ~(st->st_blksize - 1); +} + +static void p9_open(struct ring *ring, struct p9_header *hdr) +{ + device *device = ring->device; + uint32_t fid; + uint8_t mode; + struct p9_fid *fidp; + struct stat st; + struct p9_qid qid; + uint32_t iounit; + int flags; + int ret; + + ret = fill_data(ring, "Ub", &fid, &mode); + if ( ret != 2 ) + { + p9_error(ring, hdr->tag, EINVAL); + return; + } + if ( mode & ~(P9_OMODEMASK | P9_OTRUNC | P9_OREMOVE) ) + { + p9_error(ring, hdr->tag, EINVAL); + return; + } + + fidp = get_fid_ref(device, fid); + if ( !fidp ) + { + p9_error(ring, hdr->tag, ENOENT); + return; + } + if ( fidp->opened ) + { + free_fid(device, fidp); + p9_error(ring, hdr->tag, EINVAL); + return; + } + + if ( stat(fidp->path, &st) < 0 ) + { + free_fid(device, fidp); + p9_error(ring, hdr->tag, ENOENT); + return; + } + + if ( S_ISLNK(st.st_mode) ) + { + free_fid(device, fidp); + p9_error(ring, hdr->tag, EMLINK); + return; + } + + fidp->isdir = S_ISDIR(st.st_mode); + fidp->mode = mode; + if ( fidp->isdir ) + { + if ( mode != P9_OREAD ) + { + free_fid(device, fidp); + p9_error(ring, hdr->tag, EINVAL); + return; + } + fidp->data = opendir(fidp->path); + if ( !fidp->data ) + { + free_fid(device, fidp); + p9_error(ring, hdr->tag, errno); + return; + } + fidp->fd = dirfd(fidp->data); + } + else + { + flags = open_flags_from_mode(mode); + if ( flags < 0 ) + { + free_fid(device, fidp); + p9_error(ring, hdr->tag, EINVAL); + return; + } + + fidp->fd = open(fidp->path, flags); + if ( fidp->fd < 0 ) + { + free_fid(device, fidp); + p9_error(ring, hdr->tag, errno); + return; + } + } + + fill_qid(fidp->path, &qid, &st); + iounit = get_iounit(ring, &st); + fidp->opened = true; + + fill_buffer(ring, hdr->cmd + 1, hdr->tag, "QU", &qid, &iounit); +} + void *io_thread(void *arg) { struct ring *ring = arg; @@ -870,6 +1010,10 @@ void *io_thread(void *arg) p9_walk(ring, &hdr); break; + case P9_CMD_OPEN: + p9_open(ring, &hdr); + break; + default: syslog(LOG_DEBUG, "%u.%u sent unhandled command %u\n", ring->device->domid, ring->device->devid, hdr.cmd); diff --git a/tools/xen-9pfsd/xen-9pfsd.h b/tools/xen-9pfsd/xen-9pfsd.h index 75eaac9f7b..1ca3093f1a 100644 --- a/tools/xen-9pfsd/xen-9pfsd.h +++ b/tools/xen-9pfsd/xen-9pfsd.h @@ -25,7 +25,11 @@ struct p9_fid { XEN_TAILQ_ENTRY(struct p9_fid) list; unsigned int fid; unsigned int ref; + int fd; + uint8_t mode; bool opened; + bool isdir; + void *data; /* File type specific. */ char path[]; }; -- 2.35.3
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