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Diffstat (limited to 'fs/cifs/inode.c')
-rw-r--r--fs/cifs/inode.c224
1 files changed, 125 insertions, 99 deletions
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index f2df4422e54a..1dfa57982522 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -26,7 +26,6 @@
#include <linux/sched/signal.h>
#include <linux/wait_bit.h>
#include <linux/fiemap.h>
-
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
@@ -38,7 +37,7 @@
#include "cifs_unicode.h"
#include "fscache.h"
#include "fs_context.h"
-
+#include "cifs_ioctl.h"
static void cifs_set_ops(struct inode *inode)
{
@@ -157,12 +156,18 @@ cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
}
/* populate an inode with info from a cifs_fattr struct */
-void
+int
cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
{
struct cifsInodeInfo *cifs_i = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ if (!(inode->i_state & I_NEW) &&
+ unlikely(inode_wrong_type(inode, fattr->cf_mode))) {
+ CIFS_I(inode)->time = 0; /* force reval */
+ return -ESTALE;
+ }
+
cifs_revalidate_cache(inode, fattr);
spin_lock(&inode->i_lock);
@@ -219,6 +224,7 @@ cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
inode->i_flags |= S_AUTOMOUNT;
if (inode->i_state & I_NEW)
cifs_set_ops(inode);
+ return 0;
}
void
@@ -363,7 +369,7 @@ cifs_get_file_info_unix(struct file *filp)
rc = 0;
}
- cifs_fattr_to_inode(inode, &fattr);
+ rc = cifs_fattr_to_inode(inode, &fattr);
free_xid(xid);
return rc;
}
@@ -426,14 +432,7 @@ int cifs_get_inode_info_unix(struct inode **pinode,
}
/* if filetype is different, return error */
- if (unlikely(((*pinode)->i_mode & S_IFMT) !=
- (fattr.cf_mode & S_IFMT))) {
- CIFS_I(*pinode)->time = 0; /* force reval */
- rc = -ESTALE;
- goto cgiiu_exit;
- }
-
- cifs_fattr_to_inode(*pinode, &fattr);
+ rc = cifs_fattr_to_inode(*pinode, &fattr);
}
cgiiu_exit:
@@ -783,7 +782,8 @@ cifs_get_file_info(struct file *filp)
*/
fattr.cf_uniqueid = CIFS_I(inode)->uniqueid;
fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
- cifs_fattr_to_inode(inode, &fattr);
+ /* if filetype is different, return error */
+ rc = cifs_fattr_to_inode(inode, &fattr);
cgfi_exit:
free_xid(xid);
return rc;
@@ -1100,16 +1100,8 @@ handle_mnt_opt:
rc = -ESTALE;
goto out;
}
-
/* if filetype is different, return error */
- if (unlikely(((*inode)->i_mode & S_IFMT) !=
- (fattr.cf_mode & S_IFMT))) {
- CIFS_I(*inode)->time = 0; /* force reval */
- rc = -ESTALE;
- goto out;
- }
-
- cifs_fattr_to_inode(*inode, &fattr);
+ rc = cifs_fattr_to_inode(*inode, &fattr);
}
out:
cifs_buf_release(smb1_backup_rsp_buf);
@@ -1215,14 +1207,7 @@ smb311_posix_get_inode_info(struct inode **inode,
}
/* if filetype is different, return error */
- if (unlikely(((*inode)->i_mode & S_IFMT) !=
- (fattr.cf_mode & S_IFMT))) {
- CIFS_I(*inode)->time = 0; /* force reval */
- rc = -ESTALE;
- goto out;
- }
-
- cifs_fattr_to_inode(*inode, &fattr);
+ rc = cifs_fattr_to_inode(*inode, &fattr);
}
out:
cifs_put_tlink(tlink);
@@ -1249,7 +1234,7 @@ cifs_find_inode(struct inode *inode, void *opaque)
return 0;
/* don't match inode of different type */
- if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
+ if (inode_wrong_type(inode, fattr->cf_mode))
return 0;
/* if it's not a directory or has no dentries, then flag it */
@@ -1317,6 +1302,7 @@ retry_iget5_locked:
}
}
+ /* can't fail - see cifs_find_inode() */
cifs_fattr_to_inode(inode, fattr);
if (sb->s_flags & SB_NOATIME)
inode->i_flags |= S_NOATIME | S_NOCMTIME;
@@ -1408,7 +1394,7 @@ out:
int
cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
- char *full_path, __u32 dosattr)
+ const char *full_path, __u32 dosattr)
{
bool set_time = false;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
@@ -1609,7 +1595,8 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
{
int rc = 0;
unsigned int xid;
- char *full_path = NULL;
+ const char *full_path;
+ void *page;
struct inode *inode = d_inode(dentry);
struct cifsInodeInfo *cifs_inode;
struct super_block *sb = dir->i_sb;
@@ -1622,6 +1609,9 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
cifs_dbg(FYI, "cifs_unlink, dir=0x%p, dentry=0x%p\n", dir, dentry);
+ if (unlikely(cifs_forced_shutdown(cifs_sb)))
+ return -EIO;
+
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
@@ -1629,6 +1619,7 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
server = tcon->ses->server;
xid = get_xid();
+ page = alloc_dentry_path();
if (tcon->nodelete) {
rc = -EACCES;
@@ -1637,12 +1628,13 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
/* Unlink can be called from rename so we can not take the
* sb->s_vfs_rename_mutex here */
- full_path = build_path_from_dentry(dentry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ full_path = build_path_from_dentry(dentry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto unlink_out;
}
+ cifs_close_all_deferred_files(tcon);
if (cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP &
le64_to_cpu(tcon->fsUnixInfo.Capability))) {
rc = CIFSPOSIXDelFile(xid, tcon, full_path,
@@ -1713,7 +1705,7 @@ out_reval:
cifs_inode = CIFS_I(dir);
CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
unlink_out:
- kfree(full_path);
+ free_dentry_path(page);
kfree(attrs);
free_xid(xid);
cifs_put_tlink(tlink);
@@ -1740,6 +1732,16 @@ cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
if (rc)
return rc;
+ if (!S_ISDIR(inode->i_mode)) {
+ /*
+ * mkdir succeeded, but another client has managed to remove the
+ * sucker and replace it with non-directory. Return success,
+ * but don't leave the child in dcache.
+ */
+ iput(inode);
+ d_drop(dentry);
+ return 0;
+ }
/*
* setting nlink not necessary except in cases where we failed to get it
* from the server or was set bogus. Also, since this is a brand new
@@ -1791,7 +1793,7 @@ cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
}
}
d_instantiate(dentry, inode);
- return rc;
+ return 0;
}
static int
@@ -1866,12 +1868,15 @@ int cifs_mkdir(struct user_namespace *mnt_userns, struct inode *inode,
struct tcon_link *tlink;
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
- char *full_path;
+ const char *full_path;
+ void *page;
cifs_dbg(FYI, "In cifs_mkdir, mode = %04ho inode = 0x%p\n",
mode, inode);
cifs_sb = CIFS_SB(inode->i_sb);
+ if (unlikely(cifs_forced_shutdown(cifs_sb)))
+ return -EIO;
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
@@ -1879,9 +1884,10 @@ int cifs_mkdir(struct user_namespace *mnt_userns, struct inode *inode,
xid = get_xid();
- full_path = build_path_from_dentry(direntry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ page = alloc_dentry_path();
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto mkdir_out;
}
@@ -1924,7 +1930,7 @@ mkdir_out:
* attributes are invalid now.
*/
CIFS_I(inode)->time = 0;
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@@ -1938,20 +1944,26 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
struct tcon_link *tlink;
struct cifs_tcon *tcon;
struct TCP_Server_Info *server;
- char *full_path = NULL;
+ const char *full_path;
+ void *page = alloc_dentry_path();
struct cifsInodeInfo *cifsInode;
cifs_dbg(FYI, "cifs_rmdir, inode = 0x%p\n", inode);
xid = get_xid();
- full_path = build_path_from_dentry(direntry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto rmdir_exit;
}
cifs_sb = CIFS_SB(inode->i_sb);
+ if (unlikely(cifs_forced_shutdown(cifs_sb))) {
+ rc = -EIO;
+ goto rmdir_exit;
+ }
+
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink)) {
rc = PTR_ERR(tlink);
@@ -1997,7 +2009,7 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
current_time(inode);
rmdir_exit:
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
return rc;
}
@@ -2072,8 +2084,8 @@ cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir,
struct dentry *source_dentry, struct inode *target_dir,
struct dentry *target_dentry, unsigned int flags)
{
- char *from_name = NULL;
- char *to_name = NULL;
+ const char *from_name, *to_name;
+ void *page1, *page2;
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifs_tcon *tcon;
@@ -2086,29 +2098,31 @@ cifs_rename2(struct user_namespace *mnt_userns, struct inode *source_dir,
return -EINVAL;
cifs_sb = CIFS_SB(source_dir->i_sb);
+ if (unlikely(cifs_forced_shutdown(cifs_sb)))
+ return -EIO;
+
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink))
return PTR_ERR(tlink);
tcon = tlink_tcon(tlink);
+ page1 = alloc_dentry_path();
+ page2 = alloc_dentry_path();
xid = get_xid();
- /*
- * we already have the rename sem so we do not need to
- * grab it again here to protect the path integrity
- */
- from_name = build_path_from_dentry(source_dentry);
- if (from_name == NULL) {
- rc = -ENOMEM;
+ from_name = build_path_from_dentry(source_dentry, page1);
+ if (IS_ERR(from_name)) {
+ rc = PTR_ERR(from_name);
goto cifs_rename_exit;
}
- to_name = build_path_from_dentry(target_dentry);
- if (to_name == NULL) {
- rc = -ENOMEM;
+ to_name = build_path_from_dentry(target_dentry, page2);
+ if (IS_ERR(to_name)) {
+ rc = PTR_ERR(to_name);
goto cifs_rename_exit;
}
+ cifs_close_all_deferred_files(tcon);
rc = cifs_do_rename(xid, source_dentry, from_name, target_dentry,
to_name);
@@ -2177,18 +2191,21 @@ unlink_target:
cifs_rename_exit:
kfree(info_buf_source);
- kfree(from_name);
- kfree(to_name);
+ free_dentry_path(page2);
+ free_dentry_path(page1);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
}
static bool
-cifs_inode_needs_reval(struct inode *inode)
+cifs_dentry_needs_reval(struct dentry *dentry)
{
+ struct inode *inode = d_inode(dentry);
struct cifsInodeInfo *cifs_i = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
+ struct cached_fid *cfid = NULL;
if (cifs_i->time == 0)
return true;
@@ -2199,6 +2216,16 @@ cifs_inode_needs_reval(struct inode *inode)
if (!lookupCacheEnabled)
return true;
+ if (!open_cached_dir_by_dentry(tcon, dentry->d_parent, &cfid)) {
+ mutex_lock(&cfid->fid_mutex);
+ if (cfid->time && cifs_i->time > cfid->time) {
+ mutex_unlock(&cfid->fid_mutex);
+ close_cached_dir(cfid);
+ return false;
+ }
+ mutex_unlock(&cfid->fid_mutex);
+ close_cached_dir(cfid);
+ }
/*
* depending on inode type, check if attribute caching disabled for
* files or directories
@@ -2297,10 +2324,10 @@ cifs_zap_mapping(struct inode *inode)
int cifs_revalidate_file_attr(struct file *filp)
{
int rc = 0;
- struct inode *inode = file_inode(filp);
+ struct dentry *dentry = file_dentry(filp);
struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
- if (!cifs_inode_needs_reval(inode))
+ if (!cifs_dentry_needs_reval(dentry))
return rc;
if (tlink_tcon(cfile->tlink)->unix_ext)
@@ -2317,22 +2344,22 @@ int cifs_revalidate_dentry_attr(struct dentry *dentry)
int rc = 0;
struct inode *inode = d_inode(dentry);
struct super_block *sb = dentry->d_sb;
- char *full_path = NULL;
+ const char *full_path;
+ void *page;
int count = 0;
if (inode == NULL)
return -ENOENT;
- if (!cifs_inode_needs_reval(inode))
+ if (!cifs_dentry_needs_reval(dentry))
return rc;
xid = get_xid();
- /* can not safely grab the rename sem here if rename calls revalidate
- since that would deadlock */
- full_path = build_path_from_dentry(dentry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ page = alloc_dentry_path();
+ full_path = build_path_from_dentry(dentry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto out;
}
@@ -2351,7 +2378,7 @@ again:
if (rc == -EAGAIN && count++ < 10)
goto again;
out:
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
return rc;
@@ -2391,6 +2418,9 @@ int cifs_getattr(struct user_namespace *mnt_userns, const struct path *path,
struct inode *inode = d_inode(dentry);
int rc;
+ if (unlikely(cifs_forced_shutdown(CIFS_SB(inode->i_sb))))
+ return -EIO;
+
/*
* We need to be sure that all dirty pages are written and the server
* has actual ctime, mtime and file length.
@@ -2463,6 +2493,9 @@ int cifs_fiemap(struct inode *inode, struct fiemap_extent_info *fei, u64 start,
struct cifsFileInfo *cfile;
int rc;
+ if (unlikely(cifs_forced_shutdown(cifs_sb)))
+ return -EIO;
+
/*
* We need to be sure that all dirty pages are written as they
* might fill holes on the server.
@@ -2522,7 +2555,7 @@ void cifs_setsize(struct inode *inode, loff_t offset)
static int
cifs_set_file_size(struct inode *inode, struct iattr *attrs,
- unsigned int xid, char *full_path)
+ unsigned int xid, const char *full_path)
{
int rc;
struct cifsFileInfo *open_file;
@@ -2613,7 +2646,8 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
{
int rc;
unsigned int xid;
- char *full_path = NULL;
+ const char *full_path;
+ void *page = alloc_dentry_path();
struct inode *inode = d_inode(direntry);
struct cifsInodeInfo *cifsInode = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
@@ -2634,9 +2668,9 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
if (rc < 0)
goto out;
- full_path = build_path_from_dentry(direntry);
- if (full_path == NULL) {
- rc = -ENOMEM;
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
goto out;
}
@@ -2748,7 +2782,7 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
cifsInode->time = 0;
out:
kfree(args);
- kfree(full_path);
+ free_dentry_path(page);
free_xid(xid);
return rc;
}
@@ -2764,7 +2798,8 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
struct cifsInodeInfo *cifsInode = CIFS_I(inode);
struct cifsFileInfo *wfile;
struct cifs_tcon *tcon;
- char *full_path = NULL;
+ const char *full_path;
+ void *page = alloc_dentry_path();
int rc = -EACCES;
__u32 dosattr = 0;
__u64 mode = NO_CHANGE_64;
@@ -2778,16 +2813,13 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
attrs->ia_valid |= ATTR_FORCE;
rc = setattr_prepare(&init_user_ns, direntry, attrs);
- if (rc < 0) {
- free_xid(xid);
- return rc;
- }
+ if (rc < 0)
+ goto cifs_setattr_exit;
- full_path = build_path_from_dentry(direntry);
- if (full_path == NULL) {
- rc = -ENOMEM;
- free_xid(xid);
- return rc;
+ full_path = build_path_from_dentry(direntry, page);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
+ goto cifs_setattr_exit;
}
/*
@@ -2937,8 +2969,8 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
mark_inode_dirty(inode);
cifs_setattr_exit:
- kfree(full_path);
free_xid(xid);
+ free_dentry_path(page);
return rc;
}
@@ -2950,6 +2982,9 @@ cifs_setattr(struct user_namespace *mnt_userns, struct dentry *direntry,
struct cifs_tcon *pTcon = cifs_sb_master_tcon(cifs_sb);
int rc, retries = 0;
+ if (unlikely(cifs_forced_shutdown(cifs_sb)))
+ return -EIO;
+
do {
if (pTcon->unix_ext)
rc = cifs_setattr_unix(direntry, attrs);
@@ -2961,12 +2996,3 @@ cifs_setattr(struct user_namespace *mnt_userns, struct dentry *direntry,
/* BB: add cifs_setattr_legacy for really old servers */
return rc;
}
-
-#if 0
-void cifs_delete_inode(struct inode *inode)
-{
- cifs_dbg(FYI, "In cifs_delete_inode, inode = 0x%p\n", inode);
- /* may have to add back in if and when safe distributed caching of
- directories added e.g. via FindNotify */
-}
-#endif
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