[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH 14/29] tools/xenlogd: add 9pfs read request support
Add the read request of the 9pfs protocol. For now support only reading plain files (no directories). Signed-off-by: Juergen Gross <jgross@xxxxxxxx> --- tools/xenlogd/io.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/tools/xenlogd/io.c b/tools/xenlogd/io.c index 6b4692ca67..b3f9f96bcc 100644 --- a/tools/xenlogd/io.c +++ b/tools/xenlogd/io.c @@ -32,6 +32,7 @@ #define P9_CMD_WALK 110 #define P9_CMD_OPEN 112 #define P9_CMD_CREATE 114 +#define P9_CMD_READ 116 #define P9_CMD_WRITE 118 #define P9_CMD_CLUNK 120 #define P9_CMD_STAT 124 @@ -1011,6 +1012,61 @@ static void p9_create(device *device, struct p9_header *hdr) fill_buffer(device, hdr->cmd + 1, hdr->tag, "QU", &qid, &iounit); } +static void p9_read(device *device, struct p9_header *hdr) +{ + uint32_t fid; + uint64_t off; + unsigned int len; + uint32_t count; + void *buf; + struct p9_fid *fidp; + int ret; + + ret = fill_data(device, "ULU", &fid, &off, &count); + if ( ret != 3 ) + { + p9_error(device, hdr->tag, EINVAL); + return; + } + + fidp = find_fid(device, fid); + if ( !fidp || !fidp->opened ) + { + p9_error(device, hdr->tag, EBADF); + return; + } + + if ( fidp->isdir ) + { + p9_error(device, hdr->tag, EOPNOTSUPP); + return; + } + else + { + len = count; + buf = device->buffer + sizeof(*hdr) + sizeof(uint32_t); + + while ( len != 0 ) + { + ret = pread(fidp->fd, buf, len, off); + if ( ret <= 0 ) + break; + len -= ret; + buf += ret; + off += ret; + } + if ( ret && len == count ) + { + p9_error(device, hdr->tag, errno); + return; + } + + buf = device->buffer + sizeof(*hdr) + sizeof(uint32_t); + len = count - len; + fill_buffer(device, hdr->cmd + 1, hdr->tag, "D", &len, buf); + } +} + static void p9_write(device *device, struct p9_header *hdr) { uint32_t fid; @@ -1228,6 +1284,10 @@ void *io_thread(void *arg) p9_create(device, &hdr); break; + case P9_CMD_READ: + p9_read(device, &hdr); + break; + case P9_CMD_WRITE: p9_write(device, &hdr); break; -- 2.35.3
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