fs/ntfs3: atomic_open implementation
Added ntfs_atomic_open function. Relaxed locking in ntfs_create_inode. Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Родитель
07f4aa9dd2
Коммит
2b108260ea
|
@ -1184,6 +1184,18 @@ out:
|
|||
return ERR_PTR(err);
|
||||
}
|
||||
|
||||
/*
|
||||
* ntfs_create_inode
|
||||
*
|
||||
* Helper function for:
|
||||
* - ntfs_create
|
||||
* - ntfs_mknod
|
||||
* - ntfs_symlink
|
||||
* - ntfs_mkdir
|
||||
* - ntfs_atomic_open
|
||||
*
|
||||
* NOTE: if fnd != NULL (ntfs_atomic_open) then @dir is locked
|
||||
*/
|
||||
struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
|
||||
struct inode *dir, struct dentry *dentry,
|
||||
const struct cpu_str *uni, umode_t mode,
|
||||
|
@ -1213,7 +1225,8 @@ struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
|
|||
struct REPARSE_DATA_BUFFER *rp = NULL;
|
||||
bool rp_inserted = false;
|
||||
|
||||
ni_lock_dir(dir_ni);
|
||||
if (!fnd)
|
||||
ni_lock_dir(dir_ni);
|
||||
|
||||
dir_root = indx_get_root(&dir_ni->dir, dir_ni, NULL, NULL);
|
||||
if (!dir_root) {
|
||||
|
@ -1583,7 +1596,8 @@ struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
|
|||
goto out6;
|
||||
|
||||
/* Unlock parent directory before ntfs_init_acl. */
|
||||
ni_unlock(dir_ni);
|
||||
if (!fnd)
|
||||
ni_unlock(dir_ni);
|
||||
|
||||
inode->i_generation = le16_to_cpu(rec->seq);
|
||||
|
||||
|
@ -1643,7 +1657,8 @@ struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
|
|||
out7:
|
||||
|
||||
/* Undo 'indx_insert_entry'. */
|
||||
ni_lock_dir(dir_ni);
|
||||
if (!fnd)
|
||||
ni_lock_dir(dir_ni);
|
||||
indx_delete_entry(&dir_ni->dir, dir_ni, new_de + 1,
|
||||
le16_to_cpu(new_de->key_size), sbi);
|
||||
/* ni_unlock(dir_ni); will be called later. */
|
||||
|
@ -1671,7 +1686,8 @@ out2:
|
|||
|
||||
out1:
|
||||
if (err) {
|
||||
ni_unlock(dir_ni);
|
||||
if (!fnd)
|
||||
ni_unlock(dir_ni);
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
|
||||
|
|
100
fs/ntfs3/namei.c
100
fs/ntfs3/namei.c
|
@ -8,6 +8,7 @@
|
|||
#include <linux/fs.h>
|
||||
#include <linux/nls.h>
|
||||
#include <linux/ctype.h>
|
||||
#include <linux/posix_acl.h>
|
||||
|
||||
#include "debug.h"
|
||||
#include "ntfs.h"
|
||||
|
@ -334,6 +335,104 @@ out:
|
|||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* ntfs_atomic_open
|
||||
*
|
||||
* inode_operations::atomic_open
|
||||
*/
|
||||
static int ntfs_atomic_open(struct inode *dir, struct dentry *dentry,
|
||||
struct file *file, u32 flags, umode_t mode)
|
||||
{
|
||||
int err;
|
||||
struct inode *inode;
|
||||
struct ntfs_fnd *fnd = NULL;
|
||||
struct ntfs_inode *ni = ntfs_i(dir);
|
||||
struct dentry *d = NULL;
|
||||
struct cpu_str *uni = __getname();
|
||||
bool locked = false;
|
||||
|
||||
if (!uni)
|
||||
return -ENOMEM;
|
||||
|
||||
err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
|
||||
dentry->d_name.len, uni, NTFS_NAME_LEN,
|
||||
UTF16_HOST_ENDIAN);
|
||||
if (err < 0)
|
||||
goto out;
|
||||
|
||||
#ifdef CONFIG_NTFS3_FS_POSIX_ACL
|
||||
if (IS_POSIXACL(dir)) {
|
||||
/*
|
||||
* Load in cache current acl to avoid ni_lock(dir):
|
||||
* ntfs_create_inode -> ntfs_init_acl -> posix_acl_create ->
|
||||
* ntfs_get_acl -> ntfs_get_acl_ex -> ni_lock
|
||||
*/
|
||||
struct posix_acl *p = get_acl(dir, ACL_TYPE_DEFAULT);
|
||||
|
||||
if (IS_ERR(p)) {
|
||||
err = PTR_ERR(p);
|
||||
goto out;
|
||||
}
|
||||
posix_acl_release(p);
|
||||
}
|
||||
#endif
|
||||
|
||||
if (d_in_lookup(dentry)) {
|
||||
ni_lock_dir(ni);
|
||||
locked = true;
|
||||
fnd = fnd_get();
|
||||
if (!fnd) {
|
||||
err = -ENOMEM;
|
||||
goto out1;
|
||||
}
|
||||
|
||||
d = d_splice_alias(dir_search_u(dir, uni, fnd), dentry);
|
||||
if (IS_ERR(d)) {
|
||||
err = PTR_ERR(d);
|
||||
d = NULL;
|
||||
goto out2;
|
||||
}
|
||||
|
||||
if (d)
|
||||
dentry = d;
|
||||
}
|
||||
|
||||
if (!(flags & O_CREAT) || d_really_is_positive(dentry)) {
|
||||
err = finish_no_open(file, d);
|
||||
goto out2;
|
||||
}
|
||||
|
||||
file->f_mode |= FMODE_CREATED;
|
||||
|
||||
/*
|
||||
* fnd contains tree's path to insert to.
|
||||
* If fnd is not NULL then dir is locked.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Unfortunately I don't know how to get here correct 'struct nameidata *nd'
|
||||
* or 'struct user_namespace *mnt_userns'.
|
||||
* See atomic_open in fs/namei.c.
|
||||
* This is why xfstest/633 failed.
|
||||
* Looks like ntfs_atomic_open must accept 'struct user_namespace *mnt_userns' as argument.
|
||||
*/
|
||||
|
||||
inode = ntfs_create_inode(&init_user_ns, dir, dentry, uni, mode, 0,
|
||||
NULL, 0, fnd);
|
||||
err = IS_ERR(inode) ? PTR_ERR(inode)
|
||||
: finish_open(file, dentry, ntfs_file_open);
|
||||
dput(d);
|
||||
|
||||
out2:
|
||||
fnd_put(fnd);
|
||||
out1:
|
||||
if (locked)
|
||||
ni_unlock(ni);
|
||||
out:
|
||||
__putname(uni);
|
||||
return err;
|
||||
}
|
||||
|
||||
struct dentry *ntfs3_get_parent(struct dentry *child)
|
||||
{
|
||||
struct inode *inode = d_inode(child);
|
||||
|
@ -500,6 +599,7 @@ const struct inode_operations ntfs_dir_inode_operations = {
|
|||
.setattr = ntfs3_setattr,
|
||||
.getattr = ntfs_getattr,
|
||||
.listxattr = ntfs_listxattr,
|
||||
.atomic_open = ntfs_atomic_open,
|
||||
.fiemap = ntfs_fiemap,
|
||||
};
|
||||
|
||||
|
|
Загрузка…
Ссылка в новой задаче