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net/9p/protocol.c
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// SPDX-License-Identifier: GPL-2.0-only |
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/* * net/9p/protocol.c * * 9P Protocol Support Code * * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> * * Base on code from Anthony Liguori <aliguori@us.ibm.com> * Copyright (C) 2008 by IBM, Corp. |
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*/ #include <linux/module.h> #include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/uaccess.h> |
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#include <linux/slab.h> |
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#include <linux/sched.h> |
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#include <linux/stddef.h> |
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#include <linux/types.h> |
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#include <linux/uio.h> |
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#include <net/9p/9p.h> #include <net/9p/client.h> #include "protocol.h" |
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#include <trace/events/9p.h> |
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static int |
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p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...); |
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void p9stat_free(struct p9_wstat *stbuf) { kfree(stbuf->name); |
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stbuf->name = NULL; |
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kfree(stbuf->uid); |
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stbuf->uid = NULL; |
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kfree(stbuf->gid); |
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stbuf->gid = NULL; |
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kfree(stbuf->muid); |
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stbuf->muid = NULL; |
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kfree(stbuf->extension); |
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stbuf->extension = NULL; |
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} EXPORT_SYMBOL(p9stat_free); |
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size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size) |
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{ |
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size_t len = min(pdu->size - pdu->offset, size); |
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memcpy(data, &pdu->sdata[pdu->offset], len); pdu->offset += len; return size - len; } static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size) { |
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size_t len = min(pdu->capacity - pdu->size, size); |
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memcpy(&pdu->sdata[pdu->size], data, len); pdu->size += len; return size - len; } |
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static size_t |
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pdu_write_u(struct p9_fcall *pdu, struct iov_iter *from, size_t size) |
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{ |
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size_t len = min(pdu->capacity - pdu->size, size); |
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struct iov_iter i = *from; |
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if (!copy_from_iter_full(&pdu->sdata[pdu->size], len, &i)) |
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len = 0; |
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pdu->size += len; return size - len; } |
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/* b - int8_t * w - int16_t * d - int32_t * q - int64_t * s - string * u - numeric uid * g - numeric gid * S - stat * Q - qid * D - data blob (int32_t size followed by void *, results are not freed) * T - array of strings (int16_t count, followed by strings) * R - array of qids (int16_t count, followed by qids) * A - stat for 9p2000.L (p9_stat_dotl) * ? - if optional = 1, continue parsing */ |
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static int |
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p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, |
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va_list ap) |
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{ const char *ptr; int errcode = 0; for (ptr = fmt; *ptr; ptr++) { switch (*ptr) { case 'b':{ int8_t *val = va_arg(ap, int8_t *); if (pdu_read(pdu, val, sizeof(*val))) { errcode = -EFAULT; break; } } break; case 'w':{ int16_t *val = va_arg(ap, int16_t *); |
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__le16 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { |
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errcode = -EFAULT; break; } |
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*val = le16_to_cpu(le_val); |
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} break; case 'd':{ int32_t *val = va_arg(ap, int32_t *); |
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__le32 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { |
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errcode = -EFAULT; break; } |
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*val = le32_to_cpu(le_val); |
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} break; case 'q':{ int64_t *val = va_arg(ap, int64_t *); |
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__le64 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { |
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errcode = -EFAULT; break; } |
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*val = le64_to_cpu(le_val); |
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} break; case 's':{ |
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char **sptr = va_arg(ap, char **); |
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uint16_t len; |
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errcode = p9pdu_readf(pdu, proto_version, "w", &len); |
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if (errcode) break; |
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*sptr = kmalloc(len + 1, GFP_NOFS); |
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if (*sptr == NULL) { |
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errcode = -ENOMEM; |
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break; } |
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if (pdu_read(pdu, *sptr, len)) { |
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errcode = -EFAULT; |
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kfree(*sptr); *sptr = NULL; |
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} else |
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(*sptr)[len] = 0; |
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} break; |
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case 'u': { kuid_t *uid = va_arg(ap, kuid_t *); __le32 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { errcode = -EFAULT; break; } *uid = make_kuid(&init_user_ns, le32_to_cpu(le_val)); } break; case 'g': { kgid_t *gid = va_arg(ap, kgid_t *); __le32 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { errcode = -EFAULT; break; } *gid = make_kgid(&init_user_ns, le32_to_cpu(le_val)); } break; |
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case 'Q':{ struct p9_qid *qid = va_arg(ap, struct p9_qid *); |
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errcode = p9pdu_readf(pdu, proto_version, "bdq", |
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&qid->type, &qid->version, &qid->path); } break; case 'S':{ struct p9_wstat *stbuf = va_arg(ap, struct p9_wstat *); |
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memset(stbuf, 0, sizeof(struct p9_wstat)); |
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stbuf->n_uid = stbuf->n_muid = INVALID_UID; stbuf->n_gid = INVALID_GID; |
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errcode = |
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p9pdu_readf(pdu, proto_version, |
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"wwdQdddqssss?sugu", |
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&stbuf->size, &stbuf->type, &stbuf->dev, &stbuf->qid, &stbuf->mode, &stbuf->atime, &stbuf->mtime, &stbuf->length, &stbuf->name, &stbuf->uid, &stbuf->gid, &stbuf->muid, &stbuf->extension, &stbuf->n_uid, &stbuf->n_gid, &stbuf->n_muid); if (errcode) p9stat_free(stbuf); } break; case 'D':{ |
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uint32_t *count = va_arg(ap, uint32_t *); |
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void **data = va_arg(ap, void **); errcode = |
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p9pdu_readf(pdu, proto_version, "d", count); |
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if (!errcode) { *count = |
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min_t(uint32_t, *count, |
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pdu->size - pdu->offset); |
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*data = &pdu->sdata[pdu->offset]; } } break; case 'T':{ |
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uint16_t *nwname = va_arg(ap, uint16_t *); |
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char ***wnames = va_arg(ap, char ***); |
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errcode = p9pdu_readf(pdu, proto_version, "w", nwname); |
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if (!errcode) { *wnames = |
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kmalloc_array(*nwname, sizeof(char *), GFP_NOFS); |
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if (!*wnames) errcode = -ENOMEM; } if (!errcode) { int i; for (i = 0; i < *nwname; i++) { errcode = |
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p9pdu_readf(pdu, proto_version, |
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"s", &(*wnames)[i]); if (errcode) break; } } if (errcode) { if (*wnames) { int i; for (i = 0; i < *nwname; i++) kfree((*wnames)[i]); } kfree(*wnames); *wnames = NULL; } } break; case 'R':{ |
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uint16_t *nwqid = va_arg(ap, uint16_t *); |
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struct p9_qid **wqids = va_arg(ap, struct p9_qid **); *wqids = NULL; errcode = |
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p9pdu_readf(pdu, proto_version, "w", nwqid); |
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if (!errcode) { *wqids = |
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kmalloc_array(*nwqid, sizeof(struct p9_qid), GFP_NOFS); |
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if (*wqids == NULL) errcode = -ENOMEM; } if (!errcode) { int i; for (i = 0; i < *nwqid; i++) { errcode = |
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p9pdu_readf(pdu, proto_version, |
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"Q", &(*wqids)[i]); if (errcode) break; } } if (errcode) { kfree(*wqids); *wqids = NULL; } } break; |
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case 'A': { struct p9_stat_dotl *stbuf = va_arg(ap, struct p9_stat_dotl *); memset(stbuf, 0, sizeof(struct p9_stat_dotl)); errcode = p9pdu_readf(pdu, proto_version, |
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"qQdugqqqqqqqqqqqqqqq", |
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&stbuf->st_result_mask, &stbuf->qid, &stbuf->st_mode, &stbuf->st_uid, &stbuf->st_gid, &stbuf->st_nlink, &stbuf->st_rdev, &stbuf->st_size, &stbuf->st_blksize, &stbuf->st_blocks, &stbuf->st_atime_sec, &stbuf->st_atime_nsec, &stbuf->st_mtime_sec, &stbuf->st_mtime_nsec, &stbuf->st_ctime_sec, &stbuf->st_ctime_nsec, &stbuf->st_btime_sec, &stbuf->st_btime_nsec, &stbuf->st_gen, &stbuf->st_data_version); } break; |
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case '?': |
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if ((proto_version != p9_proto_2000u) && (proto_version != p9_proto_2000L)) |
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return 0; break; default: BUG(); break; } if (errcode) break; } return errcode; } int |
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p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, va_list ap) |
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{ const char *ptr; int errcode = 0; for (ptr = fmt; *ptr; ptr++) { switch (*ptr) { case 'b':{ int8_t val = va_arg(ap, int); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'w':{ |
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__le16 val = cpu_to_le16(va_arg(ap, int)); |
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if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'd':{ |
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__le32 val = cpu_to_le32(va_arg(ap, int32_t)); |
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if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'q':{ |
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__le64 val = cpu_to_le64(va_arg(ap, int64_t)); |
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if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 's':{ |
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const char *sptr = va_arg(ap, const char *); |
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uint16_t len = 0; |
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if (sptr) |
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len = min_t(size_t, strlen(sptr), |
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USHRT_MAX); |
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errcode = p9pdu_writef(pdu, proto_version, "w", len); |
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if (!errcode && pdu_write(pdu, sptr, len)) |
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errcode = -EFAULT; } break; |
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case 'u': { kuid_t uid = va_arg(ap, kuid_t); __le32 val = cpu_to_le32( from_kuid(&init_user_ns, uid)); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'g': { kgid_t gid = va_arg(ap, kgid_t); __le32 val = cpu_to_le32( from_kgid(&init_user_ns, gid)); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; |
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case 'Q':{ const struct p9_qid *qid = va_arg(ap, const struct p9_qid *); errcode = |
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p9pdu_writef(pdu, proto_version, "bdq", |
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qid->type, qid->version, qid->path); } break; case 'S':{ const struct p9_wstat *stbuf = va_arg(ap, const struct p9_wstat *); errcode = |
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p9pdu_writef(pdu, proto_version, |
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"wwdQdddqssss?sugu", |
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stbuf->size, stbuf->type, |
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stbuf->dev, &stbuf->qid, |
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stbuf->mode, stbuf->atime, stbuf->mtime, stbuf->length, stbuf->name, stbuf->uid, stbuf->gid, stbuf->muid, stbuf->extension, stbuf->n_uid, stbuf->n_gid, stbuf->n_muid); } break; |
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case 'V':{ |
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uint32_t count = va_arg(ap, uint32_t); |
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struct iov_iter *from = va_arg(ap, struct iov_iter *); |
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errcode = p9pdu_writef(pdu, proto_version, "d", count); |
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if (!errcode && pdu_write_u(pdu, from, count)) |
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errcode = -EFAULT; } break; |
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case 'T':{ |
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uint16_t nwname = va_arg(ap, int); |
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const char **wnames = va_arg(ap, const char **); |
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errcode = p9pdu_writef(pdu, proto_version, "w", nwname); |
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if (!errcode) { int i; for (i = 0; i < nwname; i++) { errcode = |
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p9pdu_writef(pdu, proto_version, |
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"s", wnames[i]); if (errcode) break; } } } break; case 'R':{ |
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uint16_t nwqid = va_arg(ap, int); |
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struct p9_qid *wqids = va_arg(ap, struct p9_qid *); |
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errcode = p9pdu_writef(pdu, proto_version, "w", nwqid); |
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if (!errcode) { int i; for (i = 0; i < nwqid; i++) { errcode = |
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p9pdu_writef(pdu, proto_version, |
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"Q", &wqids[i]); if (errcode) break; } } } break; |
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case 'I':{ struct p9_iattr_dotl *p9attr = va_arg(ap, struct p9_iattr_dotl *); errcode = p9pdu_writef(pdu, proto_version, |
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"ddugqqqqq", |
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p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid, p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, p9attr->mtime_sec, p9attr->mtime_nsec); } break; |
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case '?': |
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if ((proto_version != p9_proto_2000u) && (proto_version != p9_proto_2000L)) |
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return 0; break; default: BUG(); break; } if (errcode) break; } return errcode; } |
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int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
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{ va_list ap; int ret; va_start(ap, fmt); |
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ret = p9pdu_vreadf(pdu, proto_version, fmt, ap); |
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va_end(ap); return ret; } static int |
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p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
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{ va_list ap; int ret; va_start(ap, fmt); |
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ret = p9pdu_vwritef(pdu, proto_version, fmt, ap); |
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va_end(ap); return ret; } |
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int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st) |
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{ struct p9_fcall fake_pdu; |
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int ret; |
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fake_pdu.size = len; fake_pdu.capacity = len; fake_pdu.sdata = buf; fake_pdu.offset = 0; |
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ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "S", st); |
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if (ret) { |
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p9_debug(P9_DEBUG_9P, "<<< p9stat_read failed: %d ", ret); |
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trace_9p_protocol_dump(clnt, &fake_pdu); |
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return ret; |
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} |
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return fake_pdu.offset; |
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} EXPORT_SYMBOL(p9stat_read); |
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int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type) { |
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pdu->id = type; |
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return p9pdu_writef(pdu, 0, "dbw", 0, type, tag); } |
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int p9pdu_finalize(struct p9_client *clnt, struct p9_fcall *pdu) |
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{ int size = pdu->size; int err; pdu->size = 0; err = p9pdu_writef(pdu, 0, "d", size); pdu->size = size; |
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trace_9p_protocol_dump(clnt, pdu); |
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p9_debug(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d ", pdu->size, pdu->id, pdu->tag); |
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570 |
|
51a87c552
|
571 572 573 574 575 576 577 578 |
return err; } void p9pdu_reset(struct p9_fcall *pdu) { pdu->offset = 0; pdu->size = 0; } |
7751bdb3a
|
579 |
|
348b59012
|
580 581 |
int p9dirent_read(struct p9_client *clnt, char *buf, int len, struct p9_dirent *dirent) |
7751bdb3a
|
582 583 584 585 586 587 588 589 590 |
{ struct p9_fcall fake_pdu; int ret; char *nameptr; fake_pdu.size = len; fake_pdu.capacity = len; fake_pdu.sdata = buf; fake_pdu.offset = 0; |
348b59012
|
591 592 |
ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "Qqbs", &dirent->qid, &dirent->d_off, &dirent->d_type, &nameptr); |
7751bdb3a
|
593 |
if (ret) { |
5d3851530
|
594 595 |
p9_debug(P9_DEBUG_9P, "<<< p9dirent_read failed: %d ", ret); |
348b59012
|
596 |
trace_9p_protocol_dump(clnt, &fake_pdu); |
ef5305f1f
|
597 |
return ret; |
7751bdb3a
|
598 |
} |
ef5305f1f
|
599 600 601 602 603 604 605 606 607 |
ret = strscpy(dirent->d_name, nameptr, sizeof(dirent->d_name)); if (ret < 0) { p9_debug(P9_DEBUG_ERROR, "On the wire dirent name too long: %s ", nameptr); kfree(nameptr); return ret; } |
1b0bcbcf6
|
608 |
kfree(nameptr); |
7751bdb3a
|
609 |
|
7751bdb3a
|
610 611 612 |
return fake_pdu.offset; } EXPORT_SYMBOL(p9dirent_read); |