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Diffstat (limited to 'fs/cifs/readdir.c')
-rw-r--r--fs/cifs/readdir.c120
1 files changed, 86 insertions, 34 deletions
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index f8bea395ec9e..22557716f9af 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -3,7 +3,7 @@
*
* Directory search handling
*
- * Copyright (C) International Business Machines Corp., 2004
+ * Copyright (C) International Business Machines Corp., 2004, 2005
* Author(s): Steve French (sfrench@us.ibm.com)
*
* This library is free software; you can redistribute it and/or modify
@@ -65,14 +65,14 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
struct cifsTconInfo *pTcon;
int rc = 0;
- cFYI(1, ("For %s ", qstring->name));
+ cFYI(1, ("For %s", qstring->name));
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
pTcon = cifs_sb->tcon;
qstring->hash = full_name_hash(qstring->name, qstring->len);
tmp_dentry = d_lookup(file->f_dentry, qstring);
if (tmp_dentry) {
- cFYI(0, (" existing dentry with inode 0x%p", tmp_dentry->d_inode));
+ cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
*ptmp_inode = tmp_dentry->d_inode;
/* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
if(*ptmp_inode == NULL) {
@@ -105,8 +105,11 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
}
static void fill_in_inode(struct inode *tmp_inode,
- FILE_DIRECTORY_INFO *pfindData, int *pobject_type)
+ FILE_DIRECTORY_INFO *pfindData, int *pobject_type, int isNewInode)
{
+ loff_t local_size;
+ struct timespec local_mtime;
+
struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
__u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
@@ -116,6 +119,10 @@ static void fill_in_inode(struct inode *tmp_inode,
cifsInfo->cifsAttrs = attr;
cifsInfo->time = jiffies;
+ /* save mtime and size */
+ local_mtime = tmp_inode->i_mtime;
+ local_size = tmp_inode->i_size;
+
/* Linux can not store file creation time unfortunately so ignore it */
tmp_inode->i_atime =
cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
@@ -134,7 +141,6 @@ static void fill_in_inode(struct inode *tmp_inode,
tmp_inode->i_mode = cifs_sb->mnt_file_mode;
}
- cFYI(0,("CIFS FFIRST: Attributes came in as 0x%x",attr));
if (attr & ATTR_DIRECTORY) {
*pobject_type = DT_DIR;
/* override default perms since we do not lock dirs */
@@ -175,30 +181,46 @@ static void fill_in_inode(struct inode *tmp_inode,
(unsigned long)tmp_inode->i_size, tmp_inode->i_blocks,
tmp_inode->i_blksize));
if (S_ISREG(tmp_inode->i_mode)) {
- cFYI(1, (" File inode "));
+ cFYI(1, ("File inode"));
tmp_inode->i_op = &cifs_file_inode_ops;
if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
tmp_inode->i_fop = &cifs_file_direct_ops;
else
tmp_inode->i_fop = &cifs_file_ops;
tmp_inode->i_data.a_ops = &cifs_addr_ops;
+
+ if(isNewInode)
+ return; /* No sense invalidating pages for new inode since we
+ have not started caching readahead file data yet */
+
+ if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
+ (local_size == tmp_inode->i_size)) {
+ cFYI(1, ("inode exists but unchanged"));
+ } else {
+ /* file may have changed on server */
+ cFYI(1, ("invalidate inode, readdir detected change"));
+ invalidate_remote_inode(tmp_inode);
+ }
} else if (S_ISDIR(tmp_inode->i_mode)) {
- cFYI(1, (" Directory inode"));
+ cFYI(1, ("Directory inode"));
tmp_inode->i_op = &cifs_dir_inode_ops;
tmp_inode->i_fop = &cifs_dir_ops;
} else if (S_ISLNK(tmp_inode->i_mode)) {
- cFYI(1, (" Symbolic Link inode "));
+ cFYI(1, ("Symbolic Link inode"));
tmp_inode->i_op = &cifs_symlink_inode_ops;
} else {
- cFYI(1, (" Init special inode "));
+ cFYI(1, ("Init special inode"));
init_special_inode(tmp_inode, tmp_inode->i_mode,
tmp_inode->i_rdev);
}
}
static void unix_fill_in_inode(struct inode *tmp_inode,
- FILE_UNIX_INFO *pfindData, int *pobject_type)
+ FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
{
+ loff_t local_size;
+ struct timespec local_mtime;
+
struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
@@ -208,6 +230,10 @@ static void unix_fill_in_inode(struct inode *tmp_inode,
cifsInfo->time = jiffies;
atomic_inc(&cifsInfo->inUse);
+ /* save mtime and size */
+ local_mtime = tmp_inode->i_mtime;
+ local_size = tmp_inode->i_size;
+
tmp_inode->i_atime =
cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
tmp_inode->i_mtime =
@@ -265,6 +291,19 @@ static void unix_fill_in_inode(struct inode *tmp_inode,
else
tmp_inode->i_fop = &cifs_file_ops;
tmp_inode->i_data.a_ops = &cifs_addr_ops;
+
+ if(isNewInode)
+ return; /* No sense invalidating pages for new inode since we
+ have not started caching readahead file data yet */
+
+ if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
+ (local_size == tmp_inode->i_size)) {
+ cFYI(1, ("inode exists but unchanged"));
+ } else {
+ /* file may have changed on server */
+ cFYI(1, ("invalidate inode, readdir detected change"));
+ invalidate_remote_inode(tmp_inode);
+ }
} else if (S_ISDIR(tmp_inode->i_mode)) {
cFYI(1, ("Directory inode"));
tmp_inode->i_op = &cifs_dir_inode_ops;
@@ -314,15 +353,16 @@ static int initiate_cifs_search(const int xid, struct file *file)
return -EINVAL;
down(&file->f_dentry->d_sb->s_vfs_rename_sem);
- full_path = build_wildcard_path_from_dentry(file->f_dentry);
+ full_path = build_path_from_dentry(file->f_dentry);
up(&file->f_dentry->d_sb->s_vfs_rename_sem);
if(full_path == NULL) {
return -ENOMEM;
}
- cFYI(1, ("Full path: %s start at: %lld ", full_path, file->f_pos));
+ cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
+ffirst_retry:
/* test for Unix extensions */
if (pTcon->ses->capabilities & CAP_UNIX) {
cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
@@ -332,10 +372,16 @@ static int initiate_cifs_search(const int xid, struct file *file)
cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
}
- rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
- &cifsFile->netfid, &cifsFile->srch_inf);
+ rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
+ &cifsFile->netfid, &cifsFile->srch_inf,
+ cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
if(rc == 0)
cifsFile->invalidHandle = FALSE;
+ if((rc == -EOPNOTSUPP) &&
+ (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
+ cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
+ goto ffirst_retry;
+ }
kfree(full_path);
return rc;
}
@@ -363,10 +409,15 @@ static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
/* validate that new_entry is not past end of SMB */
if(new_entry >= end_of_smb) {
- cFYI(1,("search entry %p began after end of SMB %p old entry %p",
- new_entry,end_of_smb,old_entry));
+ cERROR(1,
+ ("search entry %p began after end of SMB %p old entry %p",
+ new_entry, end_of_smb, old_entry));
return NULL;
- } else
+ } else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
+ cERROR(1,("search entry %p extends after end of SMB %p",
+ new_entry, end_of_smb));
+ return NULL;
+ } else
return new_entry;
}
@@ -594,7 +645,12 @@ static int cifs_get_name_from_search_buf(struct qstr *pqst,
if(unicode) {
/* BB fixme - test with long names */
/* Note converted filename can be longer than in unicode */
- pqst->len = cifs_strfromUCS_le((char *)pqst->name,(wchar_t *)filename,len/2,nlt);
+ if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
+ pqst->len = cifs_convertUCSpath((char *)pqst->name,
+ (__le16 *)filename, len/2, nlt);
+ else
+ pqst->len = cifs_strfromUCS_le((char *)pqst->name,
+ (wchar_t *)filename,len/2,nlt);
} else {
pqst->name = filename;
pqst->len = len;
@@ -654,10 +710,15 @@ static int cifs_filldir(char *pfindEntry, struct file *file,
insert_inode_hash(tmp_inode);
}
+ /* we pass in rc below, indicating whether it is a new inode,
+ so we can figure out whether to invalidate the inode cached
+ data if the file has changed */
if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
- unix_fill_in_inode(tmp_inode,(FILE_UNIX_INFO *)pfindEntry,&obj_type);
+ unix_fill_in_inode(tmp_inode,
+ (FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
} else {
- fill_in_inode(tmp_inode,(FILE_DIRECTORY_INFO *)pfindEntry,&obj_type);
+ fill_in_inode(tmp_inode,
+ (FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
}
rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,tmp_inode->i_ino,obj_type);
@@ -823,7 +884,11 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
smbCalcSize((struct smb_hdr *)
cifsFile->srch_inf.ntwrk_buf_start);
- tmp_buf = kmalloc(NAME_MAX+1,GFP_KERNEL);
+ /* To be safe - for UCS to UTF-8 with strings loaded
+ with the rare long characters alloc more to account for
+ such multibyte target UTF-8 characters. cifs_unicode.c,
+ which actually does the conversion, has the same limit */
+ tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
for(i=0;(i<num_to_fill) && (rc == 0);i++) {
if(current_entry == NULL) {
/* evaluate whether this case is an error */
@@ -832,19 +897,6 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
break;
}
- /* BB FIXME - need to enable the below code BB */
-
- /* if((!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) ||
- (cifsFile->srch_inf.info_level !=
- something that supports server inodes)) {
- create dentry
- create inode
- fill in inode new_inode (getting local i_ino)
- }
- also create local inode for performance reasons (so we
- have a cache of inode metadata) unless this new mount
- parm says otherwise */
-
rc = cifs_filldir(current_entry, file,
filldir, direntry,tmp_buf);
file->f_pos++;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.