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authorStefan Metzmacher <metze@samba.org>2010-07-31 03:15:10 -0400
committerSteve French <sfrench@us.ibm.com>2010-09-29 15:04:30 -0400
commit8bfb50a882ccd9804929876470f74edcb23d2326 (patch)
treead4aa06e04fd2146edc4492aa8fbd3e87258356a /fs
parentc69c1b6eaea1b3e1eecf7ad2fba0208ac4a11131 (diff)
cifs: implement CIFSCouldBeMFSymlink() and CIFSCheckMFSymlink()
Signed-off-by: Stefan Metzmacher <metze@samba.org> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifsproto.h4
-rw-r--r--fs/cifs/link.c79
2 files changed, 83 insertions, 0 deletions
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 588612867451..8604a45c1107 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -409,4 +409,8 @@ extern int CIFSSMBSetPosixACL(const int xid, struct cifsTconInfo *tcon,
409extern int CIFSGetExtAttr(const int xid, struct cifsTconInfo *tcon, 409extern int CIFSGetExtAttr(const int xid, struct cifsTconInfo *tcon,
410 const int netfid, __u64 *pExtAttrBits, __u64 *pMask); 410 const int netfid, __u64 *pExtAttrBits, __u64 *pMask);
411extern void cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb); 411extern void cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb);
412extern bool CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr);
413extern int CIFSCheckMFSymlink(struct cifs_fattr *fattr,
414 const unsigned char *path,
415 struct cifs_sb_info *cifs_sb, int xid);
412#endif /* _CIFSPROTO_H */ 416#endif /* _CIFSPROTO_H */
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 12eb491d4c52..bec212b09a02 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -91,6 +91,85 @@ CIFSParseMFSymlink(const u8 *buf,
91 return 0; 91 return 0;
92} 92}
93 93
94bool
95CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr)
96{
97 if (!(fattr->cf_mode & S_IFREG))
98 /* it's not a symlink */
99 return false;
100
101 if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
102 /* it's not a symlink */
103 return false;
104
105 return true;
106}
107
108int
109CIFSCheckMFSymlink(struct cifs_fattr *fattr,
110 const unsigned char *path,
111 struct cifs_sb_info *cifs_sb, int xid)
112{
113 int rc;
114 int oplock = 0;
115 __u16 netfid = 0;
116 struct cifsTconInfo *pTcon = cifs_sb->tcon;
117 u8 *buf;
118 char *pbuf;
119 unsigned int bytes_read = 0;
120 int buf_type = CIFS_NO_BUFFER;
121 unsigned int link_len = 0;
122 FILE_ALL_INFO file_info;
123
124 if (!CIFSCouldBeMFSymlink(fattr))
125 /* it's not a symlink */
126 return 0;
127
128 rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
129 CREATE_NOT_DIR, &netfid, &oplock, &file_info,
130 cifs_sb->local_nls,
131 cifs_sb->mnt_cifs_flags &
132 CIFS_MOUNT_MAP_SPECIAL_CHR);
133 if (rc != 0)
134 return rc;
135
136 if (file_info.EndOfFile != CIFS_MF_SYMLINK_FILE_SIZE) {
137 CIFSSMBClose(xid, pTcon, netfid);
138 /* it's not a symlink */
139 return 0;
140 }
141
142 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
143 if (!buf)
144 return -ENOMEM;
145 pbuf = buf;
146
147 rc = CIFSSMBRead(xid, pTcon, netfid,
148 CIFS_MF_SYMLINK_FILE_SIZE /* length */,
149 0 /* offset */,
150 &bytes_read, &pbuf, &buf_type);
151 CIFSSMBClose(xid, pTcon, netfid);
152 if (rc != 0) {
153 kfree(buf);
154 return rc;
155 }
156
157 rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, NULL);
158 kfree(buf);
159 if (rc == -EINVAL)
160 /* it's not a symlink */
161 return 0;
162 if (rc != 0)
163 return rc;
164
165 /* it is a symlink */
166 fattr->cf_eof = link_len;
167 fattr->cf_mode &= ~S_IFMT;
168 fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
169 fattr->cf_dtype = DT_LNK;
170 return 0;
171}
172
94int 173int
95cifs_hardlink(struct dentry *old_file, struct inode *inode, 174cifs_hardlink(struct dentry *old_file, struct inode *inode,
96 struct dentry *direntry) 175 struct dentry *direntry)