6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Paulo Alcantara pc@manguebit.com
[ Upstream commit c520ba7573a84bd37f8803a3beeb8f6f995bf9e1 ]
In preparation to add support for creating special files also via WSL reparse points in next commits.
Signed-off-by: Paulo Alcantara pc@manguebit.com Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/smb/client/Makefile | 2 +- fs/smb/client/cifsglob.h | 13 -- fs/smb/client/cifsproto.h | 4 - fs/smb/client/inode.c | 79 +--------- fs/smb/client/readdir.c | 18 +-- fs/smb/client/reparse.c | 320 ++++++++++++++++++++++++++++++++++++++ fs/smb/client/reparse.h | 73 +++++++++ fs/smb/client/smb2ops.c | 254 +----------------------------- fs/smb/client/smb2proto.h | 6 + 9 files changed, 405 insertions(+), 364 deletions(-) create mode 100644 fs/smb/client/reparse.c create mode 100644 fs/smb/client/reparse.h
diff --git a/fs/smb/client/Makefile b/fs/smb/client/Makefile index 0b07eb94c93b3..e11985f2460b2 100644 --- a/fs/smb/client/Makefile +++ b/fs/smb/client/Makefile @@ -12,7 +12,7 @@ cifs-y := trace.o cifsfs.o cifs_debug.o connect.o dir.o file.o \ smb2ops.o smb2maperror.o smb2transport.o \ smb2misc.o smb2pdu.o smb2inode.o smb2file.o cifsacl.o fs_context.o \ dns_resolve.o cifs_spnego_negtokeninit.asn1.o asn1.o \ - namespace.o + namespace.o reparse.o
$(obj)/asn1.o: $(obj)/cifs_spnego_negtokeninit.asn1.h
diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h index 08540541046c1..296ed556be0e2 100644 --- a/fs/smb/client/cifsglob.h +++ b/fs/smb/client/cifsglob.h @@ -223,19 +223,6 @@ struct cifs_open_info_data { }; };
-static inline bool cifs_open_data_reparse(struct cifs_open_info_data *data) -{ - struct smb2_file_all_info *fi = &data->fi; - u32 attrs = le32_to_cpu(fi->Attributes); - bool ret; - - ret = data->reparse_point || (attrs & ATTR_REPARSE); - if (ret) - attrs |= ATTR_REPARSE; - fi->Attributes = cpu_to_le32(attrs); - return ret; -} - /* ***************************************************************** * Except the CIFS PDUs themselves all the diff --git a/fs/smb/client/cifsproto.h b/fs/smb/client/cifsproto.h index 50040990e70b9..8e0a348f1f660 100644 --- a/fs/smb/client/cifsproto.h +++ b/fs/smb/client/cifsproto.h @@ -210,10 +210,6 @@ extern struct inode *cifs_iget(struct super_block *sb, int cifs_get_inode_info(struct inode **inode, const char *full_path, struct cifs_open_info_data *data, struct super_block *sb, int xid, const struct cifs_fid *fid); -bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb, - struct cifs_fattr *fattr, - struct cifs_open_info_data *data); - extern int smb311_posix_get_inode_info(struct inode **inode, const char *full_path, struct cifs_open_info_data *data, diff --git a/fs/smb/client/inode.c b/fs/smb/client/inode.c index 2739cb8390804..8aff8382cfb54 100644 --- a/fs/smb/client/inode.c +++ b/fs/smb/client/inode.c @@ -26,6 +26,7 @@ #include "fs_context.h" #include "cifs_ioctl.h" #include "cached_dir.h" +#include "reparse.h"
static void cifs_set_ops(struct inode *inode) { @@ -728,84 +729,6 @@ static void smb311_posix_info_to_fattr(struct cifs_fattr *fattr, fattr->cf_mode, fattr->cf_uniqueid, fattr->cf_nlink); }
-static inline dev_t nfs_mkdev(struct reparse_posix_data *buf) -{ - u64 v = le64_to_cpu(*(__le64 *)buf->DataBuffer); - - return MKDEV(v >> 32, v & 0xffffffff); -} - -bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb, - struct cifs_fattr *fattr, - struct cifs_open_info_data *data) -{ - struct reparse_posix_data *buf = data->reparse.posix; - u32 tag = data->reparse.tag; - - if (tag == IO_REPARSE_TAG_NFS && buf) { - switch (le64_to_cpu(buf->InodeType)) { - case NFS_SPECFILE_CHR: - fattr->cf_mode |= S_IFCHR; - fattr->cf_dtype = DT_CHR; - fattr->cf_rdev = nfs_mkdev(buf); - break; - case NFS_SPECFILE_BLK: - fattr->cf_mode |= S_IFBLK; - fattr->cf_dtype = DT_BLK; - fattr->cf_rdev = nfs_mkdev(buf); - break; - case NFS_SPECFILE_FIFO: - fattr->cf_mode |= S_IFIFO; - fattr->cf_dtype = DT_FIFO; - break; - case NFS_SPECFILE_SOCK: - fattr->cf_mode |= S_IFSOCK; - fattr->cf_dtype = DT_SOCK; - break; - case NFS_SPECFILE_LNK: - fattr->cf_mode |= S_IFLNK; - fattr->cf_dtype = DT_LNK; - break; - default: - WARN_ON_ONCE(1); - return false; - } - return true; - } - - switch (tag) { - case IO_REPARSE_TAG_LX_SYMLINK: - fattr->cf_mode |= S_IFLNK; - fattr->cf_dtype = DT_LNK; - break; - case IO_REPARSE_TAG_LX_FIFO: - fattr->cf_mode |= S_IFIFO; - fattr->cf_dtype = DT_FIFO; - break; - case IO_REPARSE_TAG_AF_UNIX: - fattr->cf_mode |= S_IFSOCK; - fattr->cf_dtype = DT_SOCK; - break; - case IO_REPARSE_TAG_LX_CHR: - fattr->cf_mode |= S_IFCHR; - fattr->cf_dtype = DT_CHR; - break; - case IO_REPARSE_TAG_LX_BLK: - fattr->cf_mode |= S_IFBLK; - fattr->cf_dtype = DT_BLK; - break; - case 0: /* SMB1 symlink */ - case IO_REPARSE_TAG_SYMLINK: - case IO_REPARSE_TAG_NFS: - fattr->cf_mode |= S_IFLNK; - fattr->cf_dtype = DT_LNK; - break; - default: - return false; - } - return true; -} - static void cifs_open_info_to_fattr(struct cifs_fattr *fattr, struct cifs_open_info_data *data, struct super_block *sb) diff --git a/fs/smb/client/readdir.c b/fs/smb/client/readdir.c index 73ff9bd059682..3e5d22b356e92 100644 --- a/fs/smb/client/readdir.c +++ b/fs/smb/client/readdir.c @@ -22,6 +22,7 @@ #include "smb2proto.h" #include "fs_context.h" #include "cached_dir.h" +#include "reparse.h"
/* * To be safe - for UCS to UTF-8 with strings loaded with the rare long @@ -55,23 +56,6 @@ static inline void dump_cifs_file_struct(struct file *file, char *label) } #endif /* DEBUG2 */
-/* - * Match a reparse point inode if reparse tag and ctime haven't changed. - * - * Windows Server updates ctime of reparse points when their data have changed. - * The server doesn't allow changing reparse tags from existing reparse points, - * though it's worth checking. - */ -static inline bool reparse_inode_match(struct inode *inode, - struct cifs_fattr *fattr) -{ - struct timespec64 ctime = inode_get_ctime(inode); - - return (CIFS_I(inode)->cifsAttrs & ATTR_REPARSE) && - CIFS_I(inode)->reparse_tag == fattr->cf_cifstag && - timespec64_equal(&ctime, &fattr->cf_ctime); -} - /* * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT * diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c new file mode 100644 index 0000000000000..c405be47c84d9 --- /dev/null +++ b/fs/smb/client/reparse.c @@ -0,0 +1,320 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2024 Paulo Alcantara pc@manguebit.com + */ + +#include <linux/fs.h> +#include <linux/stat.h> +#include <linux/slab.h> +#include "cifsglob.h" +#include "smb2proto.h" +#include "cifsproto.h" +#include "cifs_unicode.h" +#include "cifs_debug.h" +#include "reparse.h" + +int smb2_create_reparse_symlink(const unsigned int xid, struct inode *inode, + struct dentry *dentry, struct cifs_tcon *tcon, + const char *full_path, const char *symname) +{ + struct reparse_symlink_data_buffer *buf = NULL; + struct cifs_open_info_data data; + struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); + struct inode *new; + struct kvec iov; + __le16 *path; + char *sym, sep = CIFS_DIR_SEP(cifs_sb); + u16 len, plen; + int rc = 0; + + sym = kstrdup(symname, GFP_KERNEL); + if (!sym) + return -ENOMEM; + + data = (struct cifs_open_info_data) { + .reparse_point = true, + .reparse = { .tag = IO_REPARSE_TAG_SYMLINK, }, + .symlink_target = sym, + }; + + convert_delimiter(sym, sep); + path = cifs_convert_path_to_utf16(sym, cifs_sb); + if (!path) { + rc = -ENOMEM; + goto out; + } + + plen = 2 * UniStrnlen((wchar_t *)path, PATH_MAX); + len = sizeof(*buf) + plen * 2; + buf = kzalloc(len, GFP_KERNEL); + if (!buf) { + rc = -ENOMEM; + goto out; + } + + buf->ReparseTag = cpu_to_le32(IO_REPARSE_TAG_SYMLINK); + buf->ReparseDataLength = cpu_to_le16(len - sizeof(struct reparse_data_buffer)); + buf->SubstituteNameOffset = cpu_to_le16(plen); + buf->SubstituteNameLength = cpu_to_le16(plen); + memcpy(&buf->PathBuffer[plen], path, plen); + buf->PrintNameOffset = 0; + buf->PrintNameLength = cpu_to_le16(plen); + memcpy(buf->PathBuffer, path, plen); + buf->Flags = cpu_to_le32(*symname != '/' ? SYMLINK_FLAG_RELATIVE : 0); + if (*sym != sep) + buf->Flags = cpu_to_le32(SYMLINK_FLAG_RELATIVE); + + convert_delimiter(sym, '/'); + iov.iov_base = buf; + iov.iov_len = len; + new = smb2_get_reparse_inode(&data, inode->i_sb, xid, + tcon, full_path, &iov); + if (!IS_ERR(new)) + d_instantiate(dentry, new); + else + rc = PTR_ERR(new); +out: + kfree(path); + cifs_free_open_info(&data); + kfree(buf); + return rc; +} + +static int nfs_set_reparse_buf(struct reparse_posix_data *buf, + mode_t mode, dev_t dev, + struct kvec *iov) +{ + u64 type; + u16 len, dlen; + + len = sizeof(*buf); + + switch ((type = reparse_mode_nfs_type(mode))) { + case NFS_SPECFILE_BLK: + case NFS_SPECFILE_CHR: + dlen = sizeof(__le64); + break; + case NFS_SPECFILE_FIFO: + case NFS_SPECFILE_SOCK: + dlen = 0; + break; + default: + return -EOPNOTSUPP; + } + + buf->ReparseTag = cpu_to_le32(IO_REPARSE_TAG_NFS); + buf->Reserved = 0; + buf->InodeType = cpu_to_le64(type); + buf->ReparseDataLength = cpu_to_le16(len + dlen - + sizeof(struct reparse_data_buffer)); + *(__le64 *)buf->DataBuffer = cpu_to_le64(((u64)MAJOR(dev) << 32) | + MINOR(dev)); + iov->iov_base = buf; + iov->iov_len = len + dlen; + return 0; +} + +int smb2_make_nfs_node(unsigned int xid, struct inode *inode, + struct dentry *dentry, struct cifs_tcon *tcon, + const char *full_path, umode_t mode, dev_t dev) +{ + struct cifs_open_info_data data; + struct reparse_posix_data *p; + struct inode *new; + struct kvec iov; + __u8 buf[sizeof(*p) + sizeof(__le64)]; + int rc; + + p = (struct reparse_posix_data *)buf; + rc = nfs_set_reparse_buf(p, mode, dev, &iov); + if (rc) + return rc; + + data = (struct cifs_open_info_data) { + .reparse_point = true, + .reparse = { .tag = IO_REPARSE_TAG_NFS, .posix = p, }, + }; + + new = smb2_get_reparse_inode(&data, inode->i_sb, xid, + tcon, full_path, &iov); + if (!IS_ERR(new)) + d_instantiate(dentry, new); + else + rc = PTR_ERR(new); + cifs_free_open_info(&data); + return rc; +} + +/* See MS-FSCC 2.1.2.6 for the 'NFS' style reparse tags */ +static int parse_reparse_posix(struct reparse_posix_data *buf, + struct cifs_sb_info *cifs_sb, + struct cifs_open_info_data *data) +{ + unsigned int len; + u64 type; + + switch ((type = le64_to_cpu(buf->InodeType))) { + case NFS_SPECFILE_LNK: + len = le16_to_cpu(buf->ReparseDataLength); + data->symlink_target = cifs_strndup_from_utf16(buf->DataBuffer, + len, true, + cifs_sb->local_nls); + if (!data->symlink_target) + return -ENOMEM; + convert_delimiter(data->symlink_target, '/'); + cifs_dbg(FYI, "%s: target path: %s\n", + __func__, data->symlink_target); + break; + case NFS_SPECFILE_CHR: + case NFS_SPECFILE_BLK: + case NFS_SPECFILE_FIFO: + case NFS_SPECFILE_SOCK: + break; + default: + cifs_dbg(VFS, "%s: unhandled inode type: 0x%llx\n", + __func__, type); + return -EOPNOTSUPP; + } + return 0; +} + +static int parse_reparse_symlink(struct reparse_symlink_data_buffer *sym, + u32 plen, bool unicode, + struct cifs_sb_info *cifs_sb, + struct cifs_open_info_data *data) +{ + unsigned int len; + unsigned int offs; + + /* We handle Symbolic Link reparse tag here. See: MS-FSCC 2.1.2.4 */ + + offs = le16_to_cpu(sym->SubstituteNameOffset); + len = le16_to_cpu(sym->SubstituteNameLength); + if (offs + 20 > plen || offs + len + 20 > plen) { + cifs_dbg(VFS, "srv returned malformed symlink buffer\n"); + return -EIO; + } + + data->symlink_target = cifs_strndup_from_utf16(sym->PathBuffer + offs, + len, unicode, + cifs_sb->local_nls); + if (!data->symlink_target) + return -ENOMEM; + + convert_delimiter(data->symlink_target, '/'); + cifs_dbg(FYI, "%s: target path: %s\n", __func__, data->symlink_target); + + return 0; +} + +int parse_reparse_point(struct reparse_data_buffer *buf, + u32 plen, struct cifs_sb_info *cifs_sb, + bool unicode, struct cifs_open_info_data *data) +{ + data->reparse.buf = buf; + + /* See MS-FSCC 2.1.2 */ + switch (le32_to_cpu(buf->ReparseTag)) { + case IO_REPARSE_TAG_NFS: + return parse_reparse_posix((struct reparse_posix_data *)buf, + cifs_sb, data); + case IO_REPARSE_TAG_SYMLINK: + return parse_reparse_symlink( + (struct reparse_symlink_data_buffer *)buf, + plen, unicode, cifs_sb, data); + case IO_REPARSE_TAG_LX_SYMLINK: + case IO_REPARSE_TAG_AF_UNIX: + case IO_REPARSE_TAG_LX_FIFO: + case IO_REPARSE_TAG_LX_CHR: + case IO_REPARSE_TAG_LX_BLK: + return 0; + default: + cifs_dbg(VFS, "%s: unhandled reparse tag: 0x%08x\n", + __func__, le32_to_cpu(buf->ReparseTag)); + return -EOPNOTSUPP; + } +} + +int smb2_parse_reparse_point(struct cifs_sb_info *cifs_sb, + struct kvec *rsp_iov, + struct cifs_open_info_data *data) +{ + struct reparse_data_buffer *buf; + struct smb2_ioctl_rsp *io = rsp_iov->iov_base; + u32 plen = le32_to_cpu(io->OutputCount); + + buf = (struct reparse_data_buffer *)((u8 *)io + + le32_to_cpu(io->OutputOffset)); + return parse_reparse_point(buf, plen, cifs_sb, true, data); +} + +bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb, + struct cifs_fattr *fattr, + struct cifs_open_info_data *data) +{ + struct reparse_posix_data *buf = data->reparse.posix; + u32 tag = data->reparse.tag; + + if (tag == IO_REPARSE_TAG_NFS && buf) { + switch (le64_to_cpu(buf->InodeType)) { + case NFS_SPECFILE_CHR: + fattr->cf_mode |= S_IFCHR; + fattr->cf_dtype = DT_CHR; + fattr->cf_rdev = reparse_nfs_mkdev(buf); + break; + case NFS_SPECFILE_BLK: + fattr->cf_mode |= S_IFBLK; + fattr->cf_dtype = DT_BLK; + fattr->cf_rdev = reparse_nfs_mkdev(buf); + break; + case NFS_SPECFILE_FIFO: + fattr->cf_mode |= S_IFIFO; + fattr->cf_dtype = DT_FIFO; + break; + case NFS_SPECFILE_SOCK: + fattr->cf_mode |= S_IFSOCK; + fattr->cf_dtype = DT_SOCK; + break; + case NFS_SPECFILE_LNK: + fattr->cf_mode |= S_IFLNK; + fattr->cf_dtype = DT_LNK; + break; + default: + WARN_ON_ONCE(1); + return false; + } + return true; + } + + switch (tag) { + case IO_REPARSE_TAG_LX_SYMLINK: + fattr->cf_mode |= S_IFLNK; + fattr->cf_dtype = DT_LNK; + break; + case IO_REPARSE_TAG_LX_FIFO: + fattr->cf_mode |= S_IFIFO; + fattr->cf_dtype = DT_FIFO; + break; + case IO_REPARSE_TAG_AF_UNIX: + fattr->cf_mode |= S_IFSOCK; + fattr->cf_dtype = DT_SOCK; + break; + case IO_REPARSE_TAG_LX_CHR: + fattr->cf_mode |= S_IFCHR; + fattr->cf_dtype = DT_CHR; + break; + case IO_REPARSE_TAG_LX_BLK: + fattr->cf_mode |= S_IFBLK; + fattr->cf_dtype = DT_BLK; + break; + case 0: /* SMB1 symlink */ + case IO_REPARSE_TAG_SYMLINK: + case IO_REPARSE_TAG_NFS: + fattr->cf_mode |= S_IFLNK; + fattr->cf_dtype = DT_LNK; + break; + default: + return false; + } + return true; +} diff --git a/fs/smb/client/reparse.h b/fs/smb/client/reparse.h new file mode 100644 index 0000000000000..3ceb90da0df90 --- /dev/null +++ b/fs/smb/client/reparse.h @@ -0,0 +1,73 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2024 Paulo Alcantara pc@manguebit.com + */ + +#ifndef _CIFS_REPARSE_H +#define _CIFS_REPARSE_H + +#include <linux/fs.h> +#include <linux/stat.h> +#include "cifsglob.h" + +static inline dev_t reparse_nfs_mkdev(struct reparse_posix_data *buf) +{ + u64 v = le64_to_cpu(*(__le64 *)buf->DataBuffer); + + return MKDEV(v >> 32, v & 0xffffffff); +} + +static inline u64 reparse_mode_nfs_type(mode_t mode) +{ + switch (mode & S_IFMT) { + case S_IFBLK: return NFS_SPECFILE_BLK; + case S_IFCHR: return NFS_SPECFILE_CHR; + case S_IFIFO: return NFS_SPECFILE_FIFO; + case S_IFSOCK: return NFS_SPECFILE_SOCK; + } + return 0; +} + +/* + * Match a reparse point inode if reparse tag and ctime haven't changed. + * + * Windows Server updates ctime of reparse points when their data have changed. + * The server doesn't allow changing reparse tags from existing reparse points, + * though it's worth checking. + */ +static inline bool reparse_inode_match(struct inode *inode, + struct cifs_fattr *fattr) +{ + struct timespec64 ctime = inode_get_ctime(inode); + + return (CIFS_I(inode)->cifsAttrs & ATTR_REPARSE) && + CIFS_I(inode)->reparse_tag == fattr->cf_cifstag && + timespec64_equal(&ctime, &fattr->cf_ctime); +} + +static inline bool cifs_open_data_reparse(struct cifs_open_info_data *data) +{ + struct smb2_file_all_info *fi = &data->fi; + u32 attrs = le32_to_cpu(fi->Attributes); + bool ret; + + ret = data->reparse_point || (attrs & ATTR_REPARSE); + if (ret) + attrs |= ATTR_REPARSE; + fi->Attributes = cpu_to_le32(attrs); + return ret; +} + +bool cifs_reparse_point_to_fattr(struct cifs_sb_info *cifs_sb, + struct cifs_fattr *fattr, + struct cifs_open_info_data *data); +int smb2_create_reparse_symlink(const unsigned int xid, struct inode *inode, + struct dentry *dentry, struct cifs_tcon *tcon, + const char *full_path, const char *symname); +int smb2_make_nfs_node(unsigned int xid, struct inode *inode, + struct dentry *dentry, struct cifs_tcon *tcon, + const char *full_path, umode_t mode, dev_t dev); +int smb2_parse_reparse_point(struct cifs_sb_info *cifs_sb, struct kvec *rsp_iov, + struct cifs_open_info_data *data); + +#endif /* _CIFS_REPARSE_H */ diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index 9ade347978709..2c59a6fc2d7c7 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -28,6 +28,7 @@ #include "fscache.h" #include "fs_context.h" #include "cached_dir.h" +#include "reparse.h"
/* Change credits for different ops and return the total number of credits */ static int @@ -2989,109 +2990,6 @@ smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses, return rc; }
-/* See MS-FSCC 2.1.2.6 for the 'NFS' style reparse tags */ -static int parse_reparse_posix(struct reparse_posix_data *buf, - struct cifs_sb_info *cifs_sb, - struct cifs_open_info_data *data) -{ - unsigned int len; - u64 type; - - switch ((type = le64_to_cpu(buf->InodeType))) { - case NFS_SPECFILE_LNK: - len = le16_to_cpu(buf->ReparseDataLength); - data->symlink_target = cifs_strndup_from_utf16(buf->DataBuffer, - len, true, - cifs_sb->local_nls); - if (!data->symlink_target) - return -ENOMEM; - convert_delimiter(data->symlink_target, '/'); - cifs_dbg(FYI, "%s: target path: %s\n", - __func__, data->symlink_target); - break; - case NFS_SPECFILE_CHR: - case NFS_SPECFILE_BLK: - case NFS_SPECFILE_FIFO: - case NFS_SPECFILE_SOCK: - break; - default: - cifs_dbg(VFS, "%s: unhandled inode type: 0x%llx\n", - __func__, type); - return -EOPNOTSUPP; - } - return 0; -} - -static int parse_reparse_symlink(struct reparse_symlink_data_buffer *sym, - u32 plen, bool unicode, - struct cifs_sb_info *cifs_sb, - struct cifs_open_info_data *data) -{ - unsigned int len; - unsigned int offs; - - /* We handle Symbolic Link reparse tag here. See: MS-FSCC 2.1.2.4 */ - - offs = le16_to_cpu(sym->SubstituteNameOffset); - len = le16_to_cpu(sym->SubstituteNameLength); - if (offs + 20 > plen || offs + len + 20 > plen) { - cifs_dbg(VFS, "srv returned malformed symlink buffer\n"); - return -EIO; - } - - data->symlink_target = cifs_strndup_from_utf16(sym->PathBuffer + offs, - len, unicode, - cifs_sb->local_nls); - if (!data->symlink_target) - return -ENOMEM; - - convert_delimiter(data->symlink_target, '/'); - cifs_dbg(FYI, "%s: target path: %s\n", __func__, data->symlink_target); - - return 0; -} - -int parse_reparse_point(struct reparse_data_buffer *buf, - u32 plen, struct cifs_sb_info *cifs_sb, - bool unicode, struct cifs_open_info_data *data) -{ - data->reparse.buf = buf; - - /* See MS-FSCC 2.1.2 */ - switch (le32_to_cpu(buf->ReparseTag)) { - case IO_REPARSE_TAG_NFS: - return parse_reparse_posix((struct reparse_posix_data *)buf, - cifs_sb, data); - case IO_REPARSE_TAG_SYMLINK: - return parse_reparse_symlink( - (struct reparse_symlink_data_buffer *)buf, - plen, unicode, cifs_sb, data); - case IO_REPARSE_TAG_LX_SYMLINK: - case IO_REPARSE_TAG_AF_UNIX: - case IO_REPARSE_TAG_LX_FIFO: - case IO_REPARSE_TAG_LX_CHR: - case IO_REPARSE_TAG_LX_BLK: - return 0; - default: - cifs_dbg(VFS, "%s: unhandled reparse tag: 0x%08x\n", - __func__, le32_to_cpu(buf->ReparseTag)); - return -EOPNOTSUPP; - } -} - -static int smb2_parse_reparse_point(struct cifs_sb_info *cifs_sb, - struct kvec *rsp_iov, - struct cifs_open_info_data *data) -{ - struct reparse_data_buffer *buf; - struct smb2_ioctl_rsp *io = rsp_iov->iov_base; - u32 plen = le32_to_cpu(io->OutputCount); - - buf = (struct reparse_data_buffer *)((u8 *)io + - le32_to_cpu(io->OutputOffset)); - return parse_reparse_point(buf, plen, cifs_sb, true, data); -} - static struct cifs_ntsd * get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb, const struct cifs_fid *cifsfid, u32 *pacllen, u32 info) @@ -5123,152 +5021,6 @@ int cifs_sfu_make_node(unsigned int xid, struct inode *inode, return rc; }
-static inline u64 mode_nfs_type(mode_t mode) -{ - switch (mode & S_IFMT) { - case S_IFBLK: return NFS_SPECFILE_BLK; - case S_IFCHR: return NFS_SPECFILE_CHR; - case S_IFIFO: return NFS_SPECFILE_FIFO; - case S_IFSOCK: return NFS_SPECFILE_SOCK; - } - return 0; -} - -static int nfs_set_reparse_buf(struct reparse_posix_data *buf, - mode_t mode, dev_t dev, - struct kvec *iov) -{ - u64 type; - u16 len, dlen; - - len = sizeof(*buf); - - switch ((type = mode_nfs_type(mode))) { - case NFS_SPECFILE_BLK: - case NFS_SPECFILE_CHR: - dlen = sizeof(__le64); - break; - case NFS_SPECFILE_FIFO: - case NFS_SPECFILE_SOCK: - dlen = 0; - break; - default: - return -EOPNOTSUPP; - } - - buf->ReparseTag = cpu_to_le32(IO_REPARSE_TAG_NFS); - buf->Reserved = 0; - buf->InodeType = cpu_to_le64(type); - buf->ReparseDataLength = cpu_to_le16(len + dlen - - sizeof(struct reparse_data_buffer)); - *(__le64 *)buf->DataBuffer = cpu_to_le64(((u64)MAJOR(dev) << 32) | - MINOR(dev)); - iov->iov_base = buf; - iov->iov_len = len + dlen; - return 0; -} - -static int nfs_make_node(unsigned int xid, struct inode *inode, - struct dentry *dentry, struct cifs_tcon *tcon, - const char *full_path, umode_t mode, dev_t dev) -{ - struct cifs_open_info_data data; - struct reparse_posix_data *p; - struct inode *new; - struct kvec iov; - __u8 buf[sizeof(*p) + sizeof(__le64)]; - int rc; - - p = (struct reparse_posix_data *)buf; - rc = nfs_set_reparse_buf(p, mode, dev, &iov); - if (rc) - return rc; - - data = (struct cifs_open_info_data) { - .reparse_point = true, - .reparse = { .tag = IO_REPARSE_TAG_NFS, .posix = p, }, - }; - - new = smb2_get_reparse_inode(&data, inode->i_sb, xid, - tcon, full_path, &iov); - if (!IS_ERR(new)) - d_instantiate(dentry, new); - else - rc = PTR_ERR(new); - cifs_free_open_info(&data); - return rc; -} - -static int smb2_create_reparse_symlink(const unsigned int xid, - struct inode *inode, - struct dentry *dentry, - struct cifs_tcon *tcon, - const char *full_path, - const char *symname) -{ - struct reparse_symlink_data_buffer *buf = NULL; - struct cifs_open_info_data data; - struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); - struct inode *new; - struct kvec iov; - __le16 *path; - char *sym, sep = CIFS_DIR_SEP(cifs_sb); - u16 len, plen; - int rc = 0; - - sym = kstrdup(symname, GFP_KERNEL); - if (!sym) - return -ENOMEM; - - data = (struct cifs_open_info_data) { - .reparse_point = true, - .reparse = { .tag = IO_REPARSE_TAG_SYMLINK, }, - .symlink_target = sym, - }; - - convert_delimiter(sym, sep); - path = cifs_convert_path_to_utf16(sym, cifs_sb); - if (!path) { - rc = -ENOMEM; - goto out; - } - - plen = 2 * UniStrnlen((wchar_t *)path, PATH_MAX); - len = sizeof(*buf) + plen * 2; - buf = kzalloc(len, GFP_KERNEL); - if (!buf) { - rc = -ENOMEM; - goto out; - } - - buf->ReparseTag = cpu_to_le32(IO_REPARSE_TAG_SYMLINK); - buf->ReparseDataLength = cpu_to_le16(len - sizeof(struct reparse_data_buffer)); - buf->SubstituteNameOffset = cpu_to_le16(plen); - buf->SubstituteNameLength = cpu_to_le16(plen); - memcpy(&buf->PathBuffer[plen], path, plen); - buf->PrintNameOffset = 0; - buf->PrintNameLength = cpu_to_le16(plen); - memcpy(buf->PathBuffer, path, plen); - buf->Flags = cpu_to_le32(*symname != '/' ? SYMLINK_FLAG_RELATIVE : 0); - if (*sym != sep) - buf->Flags = cpu_to_le32(SYMLINK_FLAG_RELATIVE); - - convert_delimiter(sym, '/'); - iov.iov_base = buf; - iov.iov_len = len; - new = smb2_get_reparse_inode(&data, inode->i_sb, xid, - tcon, full_path, &iov); - if (!IS_ERR(new)) - d_instantiate(dentry, new); - else - rc = PTR_ERR(new); -out: - kfree(path); - cifs_free_open_info(&data); - kfree(buf); - return rc; -} - static int smb2_make_node(unsigned int xid, struct inode *inode, struct dentry *dentry, struct cifs_tcon *tcon, const char *full_path, umode_t mode, dev_t dev) @@ -5286,8 +5038,8 @@ static int smb2_make_node(unsigned int xid, struct inode *inode, rc = cifs_sfu_make_node(xid, inode, dentry, tcon, full_path, mode, dev); } else { - rc = nfs_make_node(xid, inode, dentry, tcon, - full_path, mode, dev); + rc = smb2_make_nfs_node(xid, inode, dentry, tcon, + full_path, mode, dev); } return rc; } diff --git a/fs/smb/client/smb2proto.h b/fs/smb/client/smb2proto.h index 221143788a1c0..64a0ef0409a6e 100644 --- a/fs/smb/client/smb2proto.h +++ b/fs/smb/client/smb2proto.h @@ -310,5 +310,11 @@ int smb311_posix_query_path_info(const unsigned int xid, int posix_info_parse(const void *beg, const void *end, struct smb2_posix_info_parsed *out); int posix_info_sid_size(const void *beg, const void *end); +int smb2_create_reparse_symlink(const unsigned int xid, struct inode *inode, + struct dentry *dentry, struct cifs_tcon *tcon, + const char *full_path, const char *symname); +int smb2_make_nfs_node(unsigned int xid, struct inode *inode, + struct dentry *dentry, struct cifs_tcon *tcon, + const char *full_path, umode_t mode, dev_t dev);
#endif /* _SMB2PROTO_H */