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Diffstat (limited to 'fs/cifs/inode.c')
-rw-r--r--fs/cifs/inode.c149
1 files changed, 93 insertions, 56 deletions
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 6f0683c68952..4bc47e5b5f29 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -29,6 +29,7 @@
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
+#include "fscache.h"
static void cifs_set_ops(struct inode *inode, const bool is_dfs_referral)
@@ -288,7 +289,7 @@ int cifs_get_file_info_unix(struct file *filp)
struct inode *inode = filp->f_path.dentry->d_inode;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifsTconInfo *tcon = cifs_sb->tcon;
- struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
+ struct cifsFileInfo *cfile = filp->private_data;
xid = GetXid();
rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->netfid, &find_data);
@@ -515,7 +516,7 @@ int cifs_get_file_info(struct file *filp)
struct inode *inode = filp->f_path.dentry->d_inode;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifsTconInfo *tcon = cifs_sb->tcon;
- struct cifsFileInfo *cfile = (struct cifsFileInfo *) filp->private_data;
+ struct cifsFileInfo *cfile = filp->private_data;
xid = GetXid();
rc = CIFSSMBQFileInfo(xid, tcon, cfile->netfid, &find_data);
@@ -723,18 +724,17 @@ cifs_find_inode(struct inode *inode, void *opaque)
{
struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
+ /* don't match inode with different uniqueid */
if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
return 0;
- /*
- * uh oh -- it's a directory. We can't use it since hardlinked dirs are
- * verboten. Disable serverino and return it as if it were found, the
- * caller can discard it, generate a uniqueid and retry the find
- */
- if (S_ISDIR(inode->i_mode) && !list_empty(&inode->i_dentry)) {
+ /* don't match inode of different type */
+ if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
+ return 0;
+
+ /* if it's not a directory or has no dentries, then flag it */
+ if (S_ISDIR(inode->i_mode) && !list_empty(&inode->i_dentry))
fattr->cf_flags |= CIFS_FATTR_INO_COLLISION;
- cifs_autodisable_serverino(CIFS_SB(inode->i_sb));
- }
return 1;
}
@@ -748,6 +748,27 @@ cifs_init_inode(struct inode *inode, void *opaque)
return 0;
}
+/*
+ * walk dentry list for an inode and report whether it has aliases that
+ * are hashed. We use this to determine if a directory inode can actually
+ * be used.
+ */
+static bool
+inode_has_hashed_dentries(struct inode *inode)
+{
+ struct dentry *dentry;
+
+ spin_lock(&dcache_lock);
+ list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
+ if (!d_unhashed(dentry) || IS_ROOT(dentry)) {
+ spin_unlock(&dcache_lock);
+ return true;
+ }
+ }
+ spin_unlock(&dcache_lock);
+ return false;
+}
+
/* Given fattrs, get a corresponding inode */
struct inode *
cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
@@ -763,12 +784,16 @@ retry_iget5_locked:
inode = iget5_locked(sb, hash, cifs_find_inode, cifs_init_inode, fattr);
if (inode) {
- /* was there a problematic inode number collision? */
+ /* was there a potentially problematic inode collision? */
if (fattr->cf_flags & CIFS_FATTR_INO_COLLISION) {
- iput(inode);
- fattr->cf_uniqueid = iunique(sb, ROOT_I);
fattr->cf_flags &= ~CIFS_FATTR_INO_COLLISION;
- goto retry_iget5_locked;
+
+ if (inode_has_hashed_dentries(inode)) {
+ cifs_autodisable_serverino(CIFS_SB(sb));
+ iput(inode);
+ fattr->cf_uniqueid = iunique(sb, ROOT_I);
+ goto retry_iget5_locked;
+ }
}
cifs_fattr_to_inode(inode, fattr);
@@ -776,6 +801,10 @@ retry_iget5_locked:
inode->i_flags |= S_NOATIME | S_NOCMTIME;
if (inode->i_state & I_NEW) {
inode->i_ino = hash;
+#ifdef CONFIG_CIFS_FSCACHE
+ /* initialize per-inode cache cookie pointer */
+ CIFS_I(inode)->fscache = NULL;
+#endif
unlock_new_inode(inode);
}
}
@@ -807,6 +836,11 @@ struct inode *cifs_root_iget(struct super_block *sb, unsigned long ino)
if (!inode)
return ERR_PTR(-ENOMEM);
+#ifdef CONFIG_CIFS_FSCACHE
+ /* populate tcon->resource_id */
+ cifs_sb->tcon->resource_id = CIFS_I(inode)->uniqueid;
+#endif
+
if (rc && cifs_sb->tcon->ipc) {
cFYI(1, "ipc connection - fake read inode");
inode->i_mode |= S_IFDIR;
@@ -1568,6 +1602,7 @@ cifs_invalidate_mapping(struct inode *inode)
cifs_i->write_behind_rc = rc;
}
invalidate_remote_inode(inode);
+ cifs_fscache_reset_inode_cookie(inode);
}
int cifs_revalidate_file(struct file *filp)
@@ -1663,26 +1698,16 @@ static int cifs_truncate_page(struct address_space *mapping, loff_t from)
return rc;
}
-static int cifs_vmtruncate(struct inode *inode, loff_t offset)
+static void cifs_setsize(struct inode *inode, loff_t offset)
{
loff_t oldsize;
- int err;
spin_lock(&inode->i_lock);
- err = inode_newsize_ok(inode, offset);
- if (err) {
- spin_unlock(&inode->i_lock);
- goto out;
- }
-
oldsize = inode->i_size;
i_size_write(inode, offset);
spin_unlock(&inode->i_lock);
+
truncate_pagecache(inode, oldsize, offset);
- if (inode->i_op->truncate)
- inode->i_op->truncate(inode);
-out:
- return err;
}
static int
@@ -1755,7 +1780,7 @@ cifs_set_file_size(struct inode *inode, struct iattr *attrs,
if (rc == 0) {
cifsInode->server_eof = attrs->ia_size;
- rc = cifs_vmtruncate(inode, attrs->ia_size);
+ cifs_setsize(inode, attrs->ia_size);
cifs_truncate_page(inode->i_mapping, inode->i_size);
}
@@ -1780,14 +1805,12 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
xid = GetXid();
- if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
- /* check if we have permission to change attrs */
- rc = inode_change_ok(inode, attrs);
- if (rc < 0)
- goto out;
- else
- rc = 0;
- }
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
+ attrs->ia_valid |= ATTR_FORCE;
+
+ rc = inode_change_ok(inode, attrs);
+ if (rc < 0)
+ goto out;
full_path = build_path_from_dentry(direntry);
if (full_path == NULL) {
@@ -1873,18 +1896,24 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
CIFS_MOUNT_MAP_SPECIAL_CHR);
}
- if (!rc) {
- rc = inode_setattr(inode, attrs);
+ if (rc)
+ goto out;
- /* force revalidate when any of these times are set since some
- of the fs types (eg ext3, fat) do not have fine enough
- time granularity to match protocol, and we do not have a
- a way (yet) to query the server fs's time granularity (and
- whether it rounds times down).
- */
- if (!rc && (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME)))
- cifsInode->time = 0;
- }
+ if ((attrs->ia_valid & ATTR_SIZE) &&
+ attrs->ia_size != i_size_read(inode))
+ truncate_setsize(inode, attrs->ia_size);
+
+ setattr_copy(inode, attrs);
+ mark_inode_dirty(inode);
+
+ /* force revalidate when any of these times are set since some
+ of the fs types (eg ext3, fat) do not have fine enough
+ time granularity to match protocol, and we do not have a
+ a way (yet) to query the server fs's time granularity (and
+ whether it rounds times down).
+ */
+ if (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME))
+ cifsInode->time = 0;
out:
kfree(args);
kfree(full_path);
@@ -1909,14 +1938,13 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
cFYI(1, "setattr on file %s attrs->iavalid 0x%x",
direntry->d_name.name, attrs->ia_valid);
- if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) == 0) {
- /* check if we have permission to change attrs */
- rc = inode_change_ok(inode, attrs);
- if (rc < 0) {
- FreeXid(xid);
- return rc;
- } else
- rc = 0;
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
+ attrs->ia_valid |= ATTR_FORCE;
+
+ rc = inode_change_ok(inode, attrs);
+ if (rc < 0) {
+ FreeXid(xid);
+ return rc;
}
full_path = build_path_from_dentry(direntry);
@@ -2024,8 +2052,17 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
/* do not need local check to inode_check_ok since the server does
that */
- if (!rc)
- rc = inode_setattr(inode, attrs);
+ if (rc)
+ goto cifs_setattr_exit;
+
+ if ((attrs->ia_valid & ATTR_SIZE) &&
+ attrs->ia_size != i_size_read(inode))
+ truncate_setsize(inode, attrs->ia_size);
+
+ setattr_copy(inode, attrs);
+ mark_inode_dirty(inode);
+ return 0;
+
cifs_setattr_exit:
kfree(full_path);
FreeXid(xid);