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authorSteve French <sfrench@us.ibm.com>2008-10-11 16:55:11 +0000
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-18 10:49:11 -0700
commit92fa67e9260a65f69d868c4fcc92c9cee428c6f9 (patch)
tree6c88d6f85f2ec7cf1f18851866441f1036fb8304
parent074555fe0e36c1bde7795e8f3f7350d228b9dd1c (diff)
downloadlwn-92fa67e9260a65f69d868c4fcc92c9cee428c6f9.tar.gz
lwn-92fa67e9260a65f69d868c4fcc92c9cee428c6f9.zip
CIFS: make sure we have the right resume info before calling CIFSFindNext
commit 0752f1522a9120f731232919f7ad904e9e22b8ce upstream When we do a seekdir() or equivalent, we usually end up doing a FindFirst call and then call FindNext until we get to the offset that we want. The problem is that when we call FindNext, the code usually doesn't have the proper info (mostly, the filename of the entry from the last search) to resume the search. Add a "last_entry" field to the cifs_search_info that points to the last entry in the search. We calculate this pointer by using the LastNameOffset field from the search parms that are returned. We then use that info to do a cifs_save_resume_key before we call CIFSFindNext. This patch allows CIFS to reliably pass the "telldir" connectathon test. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/cifs/cifsglob.h1
-rw-r--r--fs/cifs/cifssmb.c4
-rw-r--r--fs/cifs/readdir.c128
3 files changed, 70 insertions, 63 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 8dfd6f24d488..0d22479d99b7 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -309,6 +309,7 @@ struct cifs_search_info {
__u32 resume_key;
char *ntwrk_buf_start;
char *srch_entries_start;
+ char *last_entry;
char *presume_name;
unsigned int resume_name_len;
bool endOfSearch:1;
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 994de7c90474..77a0d1fa27d0 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -3636,6 +3636,8 @@ findFirstRetry:
le16_to_cpu(parms->SearchCount);
psrch_inf->index_of_last_entry = 2 /* skip . and .. */ +
psrch_inf->entries_in_buffer;
+ psrch_inf->last_entry = psrch_inf->srch_entries_start +
+ le16_to_cpu(parms->LastNameOffset);
*pnetfid = parms->SearchHandle;
} else {
cifs_buf_release(pSMB);
@@ -3751,6 +3753,8 @@ int CIFSFindNext(const int xid, struct cifsTconInfo *tcon,
le16_to_cpu(parms->SearchCount);
psrch_inf->index_of_last_entry +=
psrch_inf->entries_in_buffer;
+ psrch_inf->last_entry = psrch_inf->srch_entries_start +
+ le16_to_cpu(parms->LastNameOffset);
/* cFYI(1,("fnxt2 entries in buf %d index_of_last %d",
psrch_inf->entries_in_buffer, psrch_inf->index_of_last_entry)); */
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 5f40ed3473f5..765adf12d54f 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -640,6 +640,70 @@ static int is_dir_changed(struct file *file)
}
+static int cifs_save_resume_key(const char *current_entry,
+ struct cifsFileInfo *cifsFile)
+{
+ int rc = 0;
+ unsigned int len = 0;
+ __u16 level;
+ char *filename;
+
+ if ((cifsFile == NULL) || (current_entry == NULL))
+ return -EINVAL;
+
+ level = cifsFile->srch_inf.info_level;
+
+ if (level == SMB_FIND_FILE_UNIX) {
+ FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
+
+ filename = &pFindData->FileName[0];
+ if (cifsFile->srch_inf.unicode) {
+ len = cifs_unicode_bytelen(filename);
+ } else {
+ /* BB should we make this strnlen of PATH_MAX? */
+ len = strnlen(filename, PATH_MAX);
+ }
+ cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
+ } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
+ FILE_DIRECTORY_INFO *pFindData =
+ (FILE_DIRECTORY_INFO *)current_entry;
+ filename = &pFindData->FileName[0];
+ len = le32_to_cpu(pFindData->FileNameLength);
+ cifsFile->srch_inf.resume_key = pFindData->FileIndex;
+ } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
+ FILE_FULL_DIRECTORY_INFO *pFindData =
+ (FILE_FULL_DIRECTORY_INFO *)current_entry;
+ filename = &pFindData->FileName[0];
+ len = le32_to_cpu(pFindData->FileNameLength);
+ cifsFile->srch_inf.resume_key = pFindData->FileIndex;
+ } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
+ SEARCH_ID_FULL_DIR_INFO *pFindData =
+ (SEARCH_ID_FULL_DIR_INFO *)current_entry;
+ filename = &pFindData->FileName[0];
+ len = le32_to_cpu(pFindData->FileNameLength);
+ cifsFile->srch_inf.resume_key = pFindData->FileIndex;
+ } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
+ FILE_BOTH_DIRECTORY_INFO *pFindData =
+ (FILE_BOTH_DIRECTORY_INFO *)current_entry;
+ filename = &pFindData->FileName[0];
+ len = le32_to_cpu(pFindData->FileNameLength);
+ cifsFile->srch_inf.resume_key = pFindData->FileIndex;
+ } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
+ FIND_FILE_STANDARD_INFO *pFindData =
+ (FIND_FILE_STANDARD_INFO *)current_entry;
+ filename = &pFindData->FileName[0];
+ /* one byte length, no name conversion */
+ len = (unsigned int)pFindData->FileNameLength;
+ cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
+ } else {
+ cFYI(1, ("Unknown findfirst level %d", level));
+ return -EINVAL;
+ }
+ cifsFile->srch_inf.resume_name_len = len;
+ cifsFile->srch_inf.presume_name = filename;
+ return rc;
+}
+
/* find the corresponding entry in the search */
/* Note that the SMB server returns search entries for . and .. which
complicates logic here if we choose to parse for them and we do not
@@ -703,6 +767,7 @@ static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
(rc == 0) && !cifsFile->srch_inf.endOfSearch) {
cFYI(1, ("calling findnext2"));
+ cifs_save_resume_key(cifsFile->srch_inf.last_entry, cifsFile);
rc = CIFSFindNext(xid, pTcon, cifsFile->netfid,
&cifsFile->srch_inf);
if (rc)
@@ -919,69 +984,6 @@ static int cifs_filldir(char *pfindEntry, struct file *file,
return rc;
}
-static int cifs_save_resume_key(const char *current_entry,
- struct cifsFileInfo *cifsFile)
-{
- int rc = 0;
- unsigned int len = 0;
- __u16 level;
- char *filename;
-
- if ((cifsFile == NULL) || (current_entry == NULL))
- return -EINVAL;
-
- level = cifsFile->srch_inf.info_level;
-
- if (level == SMB_FIND_FILE_UNIX) {
- FILE_UNIX_INFO *pFindData = (FILE_UNIX_INFO *)current_entry;
-
- filename = &pFindData->FileName[0];
- if (cifsFile->srch_inf.unicode) {
- len = cifs_unicode_bytelen(filename);
- } else {
- /* BB should we make this strnlen of PATH_MAX? */
- len = strnlen(filename, PATH_MAX);
- }
- cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
- } else if (level == SMB_FIND_FILE_DIRECTORY_INFO) {
- FILE_DIRECTORY_INFO *pFindData =
- (FILE_DIRECTORY_INFO *)current_entry;
- filename = &pFindData->FileName[0];
- len = le32_to_cpu(pFindData->FileNameLength);
- cifsFile->srch_inf.resume_key = pFindData->FileIndex;
- } else if (level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
- FILE_FULL_DIRECTORY_INFO *pFindData =
- (FILE_FULL_DIRECTORY_INFO *)current_entry;
- filename = &pFindData->FileName[0];
- len = le32_to_cpu(pFindData->FileNameLength);
- cifsFile->srch_inf.resume_key = pFindData->FileIndex;
- } else if (level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
- SEARCH_ID_FULL_DIR_INFO *pFindData =
- (SEARCH_ID_FULL_DIR_INFO *)current_entry;
- filename = &pFindData->FileName[0];
- len = le32_to_cpu(pFindData->FileNameLength);
- cifsFile->srch_inf.resume_key = pFindData->FileIndex;
- } else if (level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
- FILE_BOTH_DIRECTORY_INFO *pFindData =
- (FILE_BOTH_DIRECTORY_INFO *)current_entry;
- filename = &pFindData->FileName[0];
- len = le32_to_cpu(pFindData->FileNameLength);
- cifsFile->srch_inf.resume_key = pFindData->FileIndex;
- } else if (level == SMB_FIND_FILE_INFO_STANDARD) {
- FIND_FILE_STANDARD_INFO *pFindData =
- (FIND_FILE_STANDARD_INFO *)current_entry;
- filename = &pFindData->FileName[0];
- /* one byte length, no name conversion */
- len = (unsigned int)pFindData->FileNameLength;
- cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
- } else {
- cFYI(1, ("Unknown findfirst level %d", level));
- return -EINVAL;
- }
- cifsFile->srch_inf.resume_name_len = len;
- cifsFile->srch_inf.presume_name = filename;
- return rc;
-}
int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
{