Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2d785a50a8aa404c19f56d2c22445e48e418112b
Commit:     2d785a50a8aa404c19f56d2c22445e48e418112b
Parent:     50c2f75388727018c3c357454a247072915a9e3f
Author:     Steve French <[EMAIL PROTECTED]>
AuthorDate: Sun Jul 15 01:48:57 2007 +0000
Committer:  Steve French <[EMAIL PROTECTED]>
CommitDate: Sun Jul 15 01:48:57 2007 +0000

    [CIFS] Add support for new POSIX unlink
    
    In the cleanup phase of the dbench test, we were noticing sharing
    violation followed by failed directory removals when dbench
    did not close the test files before the cleanup phase started.
    Using the new POSIX unlink, which Samba has supported for a few
    months, avoids this.
    
    Signed-off-by: Steve French <[EMAIL PROTECTED]>
---
 fs/cifs/CHANGES     |    4 ++-
 fs/cifs/cifspdu.h   |    6 +++
 fs/cifs/cifsproto.h |    5 ++-
 fs/cifs/cifssmb.c   |   85 ++++++++++++++++++++++++++++++++++++++++++++++-----
 fs/cifs/inode.c     |   14 ++++++++-
 5 files changed, 103 insertions(+), 11 deletions(-)

diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index f92e0ee..6d84ca2 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -1,7 +1,9 @@
 Version 1.50
 ------------
 Fix NTLMv2 signing. NFS server mounted over cifs works (if cifs mount is
-done with "serverino" mount option).
+done with "serverino" mount option).  Add support for POSIX Unlink
+(helps with certain sharing violation cases when server such as
+Samba supports newer POSIX CIFS Protocol Extensions).
 
 Version 1.49
 ------------
diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
index 9044d98..6a2056e 100644
--- a/fs/cifs/cifspdu.h
+++ b/fs/cifs/cifspdu.h
@@ -2155,6 +2155,12 @@ typedef struct {
        /* struct following varies based on requested level */
 } __attribute__((packed)) OPEN_PSX_RSP; /* level 0x209 SetPathInfo data */
 
+#define SMB_POSIX_UNLINK_FILE_TARGET           0
+#define SMB_POSIX_UNLINK_DIRECTORY_TARGET      1
+
+struct unlink_psx_rq { /* level 0x20a SetPathInfo */
+       __le16 type;
+} __attribute__((packed));
 
 struct file_internal_info {
        __u64  UniqueId; /* inode number */
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 3a76c72..04a69da 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -196,7 +196,10 @@ extern int CIFSSMBMkDir(const int xid, struct cifsTconInfo 
*tcon,
 extern int CIFSSMBRmDir(const int xid, struct cifsTconInfo *tcon,
                        const char *name, const struct nls_table *nls_codepage,
                        int remap_special_chars);
-
+extern int CIFSPOSIXDelFile(const int xid, struct cifsTconInfo *tcon,
+                       const char *name, __u16 type,
+                       const struct nls_table *nls_codepage,
+                       int remap_special_chars);
 extern int CIFSSMBDelFile(const int xid, struct cifsTconInfo *tcon,
                        const char *name,
                        const struct nls_table *nls_codepage,
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 3ab78b7..b339f5f 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -789,6 +789,82 @@ CIFSSMBLogoff(const int xid, struct cifsSesInfo *ses)
 }
 
 int
+CIFSPOSIXDelFile(const int xid, struct cifsTconInfo *tcon, const char 
*fileName,
+                __u16 type, const struct nls_table *nls_codepage, int remap)
+{
+       TRANSACTION2_SPI_REQ *pSMB = NULL;
+       TRANSACTION2_SPI_RSP *pSMBr = NULL;
+       struct unlink_psx_rq *pRqD;
+       int name_len;
+       int rc = 0;
+       int bytes_returned = 0;
+       __u16 params, param_offset, offset, byte_count;
+
+       cFYI(1, ("In POSIX delete"));
+PsxDelete:
+       rc = smb_init(SMB_COM_TRANSACTION2, 15, tcon, (void **) &pSMB,
+                     (void **) &pSMBr);
+       if (rc)
+               return rc;
+
+       if (pSMB->hdr.Flags2 & SMBFLG2_UNICODE) {
+               name_len =
+                   cifsConvertToUCS((__le16 *) pSMB->FileName, fileName,
+                                    PATH_MAX, nls_codepage, remap);
+               name_len++;     /* trailing null */
+               name_len *= 2;
+       } else { /* BB add path length overrun check */
+               name_len = strnlen(fileName, PATH_MAX);
+               name_len++;     /* trailing null */
+               strncpy(pSMB->FileName, fileName, name_len);
+       }
+
+       params = 6 + name_len;
+       pSMB->MaxParameterCount = cpu_to_le16(2);
+       pSMB->MaxDataCount = 0; /* BB double check this with jra */
+       pSMB->MaxSetupCount = 0;
+       pSMB->Reserved = 0;
+       pSMB->Flags = 0;
+       pSMB->Timeout = 0;
+       pSMB->Reserved2 = 0;
+       param_offset = offsetof(struct smb_com_transaction2_spi_req,
+                               InformationLevel) - 4;
+       offset = param_offset + params;
+
+       /* Setup pointer to Request Data (inode type) */
+       pRqD = (struct unlink_psx_rq *)(((char *)&pSMB->hdr.Protocol) + offset);
+       pRqD->type = cpu_to_le16(type);
+       pSMB->ParameterOffset = cpu_to_le16(param_offset);
+       pSMB->DataOffset = cpu_to_le16(offset);
+       pSMB->SetupCount = 1;
+       pSMB->Reserved3 = 0;
+       pSMB->SubCommand = cpu_to_le16(TRANS2_SET_PATH_INFORMATION);
+       byte_count = 3 /* pad */  + params + sizeof(struct unlink_psx_rq);
+
+       pSMB->DataCount = cpu_to_le16(sizeof(struct unlink_psx_rq));
+       pSMB->TotalDataCount = cpu_to_le16(sizeof(struct unlink_psx_rq));
+       pSMB->ParameterCount = cpu_to_le16(params);
+       pSMB->TotalParameterCount = pSMB->ParameterCount;
+       pSMB->InformationLevel = cpu_to_le16(SMB_POSIX_UNLINK);
+       pSMB->Reserved4 = 0;
+       pSMB->hdr.smb_buf_length += byte_count;
+       pSMB->ByteCount = cpu_to_le16(byte_count);
+       rc = SendReceive(xid, tcon->ses, (struct smb_hdr *) pSMB,
+                        (struct smb_hdr *) pSMBr, &bytes_returned, 0);
+       if (rc) {
+               cFYI(1, ("Posix delete returned %d", rc));
+       }
+       cifs_buf_release(pSMB);
+
+       cifs_stats_inc(&tcon->num_deletes);
+
+       if (rc == -EAGAIN)
+               goto PsxDelete;
+
+       return rc;
+}
+
+int
 CIFSSMBDelFile(const int xid, struct cifsTconInfo *tcon, const char *fileName,
               const struct nls_table *nls_codepage, int remap)
 {
@@ -933,7 +1009,6 @@ CIFSPOSIXCreate(const int xid, struct cifsTconInfo *tcon, 
__u32 posix_flags,
        int name_len;
        int rc = 0;
        int bytes_returned = 0;
-       char *data_offset;
        __u16 params, param_offset, offset, byte_count, count;
        OPEN_PSX_REQ * pdata;
        OPEN_PSX_RSP * psx_rsp;
@@ -969,7 +1044,6 @@ PsxCreat:
        param_offset = offsetof(struct smb_com_transaction2_spi_req,
                                InformationLevel) - 4;
        offset = param_offset + params;
-       data_offset = (char *) (&pSMB->hdr.Protocol) + offset;
        pdata = (OPEN_PSX_REQ *)(((char *)&pSMB->hdr.Protocol) + offset);
        pdata->Level = SMB_QUERY_FILE_UNIX_BASIC;
        pdata->Permissions = cpu_to_le64(mode);
@@ -1671,7 +1745,6 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
 {
        struct smb_com_transaction2_sfi_req *pSMB  = NULL;
        struct smb_com_transaction2_sfi_rsp *pSMBr = NULL;
-       char *data_offset;
        struct cifs_posix_lock *parm_data;
        int rc = 0;
        int timeout = 0;
@@ -1698,8 +1771,6 @@ CIFSSMBPosixLock(const int xid, struct cifsTconInfo *tcon,
        param_offset = offsetof(struct smb_com_transaction2_sfi_req, Fid) - 4;
        offset = param_offset + params;
 
-       data_offset = (char *) (&pSMB->hdr.Protocol) + offset;
-
        count = sizeof(struct cifs_posix_lock);
        pSMB->MaxParameterCount = cpu_to_le16(2);
        pSMB->MaxDataCount = cpu_to_le16(1000); /* BB find max SMB PDU from 
sess */
@@ -2120,9 +2191,7 @@ createSymLinkRetry:
                         (struct smb_hdr *) pSMBr, &bytes_returned, 0);
        cifs_stats_inc(&tcon->num_symlinks);
        if (rc) {
-               cFYI(1,
-                    ("Send error in SetPathInfo (create symlink) = %d",
-                     rc));
+               cFYI(1, ("Send error in SetPathInfo create symlink = %d", rc));
        }
 
        if (pSMB)
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index a1ca556..cfa5b36 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -620,9 +620,21 @@ int cifs_unlink(struct inode *inode, struct dentry 
*direntry)
                FreeXid(xid);
                return -ENOMEM;
        }
-       rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
+
+       if ((pTcon->ses->capabilities & CAP_UNIX) &&
+               (CIFS_UNIX_POSIX_PATH_OPS_CAP &
+                       le64_to_cpu(pTcon->fsUnixInfo.Capability))) {
+               rc = CIFSPOSIXDelFile(xid, pTcon, full_path,
+                       SMB_POSIX_UNLINK_FILE_TARGET, cifs_sb->local_nls,
                        cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+               cFYI(1, ("posix del rc %d", rc));
+               if ((rc == 0) || (rc == -ENOENT))
+                       goto psx_del_no_retry;
+       }
 
+       rc = CIFSSMBDelFile(xid, pTcon, full_path, cifs_sb->local_nls,
+                       cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+psx_del_no_retry:
        if (!rc) {
                if (direntry->d_inode)
                        drop_nlink(direntry->d_inode);
-
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