From: Al Viro <viro@ZenIV.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
Miklos Szeredi <mszeredi@redhat.com>
Subject: [RFC][PATCH 29/42] __shmem_file_setup(): reorder allocations
Date: Wed, 11 Jul 2018 03:21:53 +0100 [thread overview]
Message-ID: <20180711022206.12571-29-viro@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20180711022206.12571-1-viro@ZenIV.linux.org.uk>
From: Al Viro <viro@zeniv.linux.org.uk>
grab inode and reserve memory first.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
mm/shmem.c | 43 ++++++++++++++++++++-----------------------
1 file changed, 20 insertions(+), 23 deletions(-)
diff --git a/mm/shmem.c b/mm/shmem.c
index 2cab84403055..1146a48926bc 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3918,41 +3918,38 @@ static struct file *__shmem_file_setup(struct vfsmount *mnt, const char *name, l
if (shmem_acct_size(flags, size))
return ERR_PTR(-ENOMEM);
- res = ERR_PTR(-ENOMEM);
+ sb = mnt->mnt_sb;
+ inode = shmem_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0, flags);
+ if (unlikely(!inode)) {
+ shmem_unacct_size(flags, size);
+ return ERR_PTR(-ENOSPC);
+ }
+ inode->i_flags |= i_flags;
+ inode->i_size = size;
+ clear_nlink(inode); /* It is unlinked */
+ res = ERR_PTR(ramfs_nommu_expand_for_mapping(inode, size));
+ if (IS_ERR(res)) {
+ iput(inode);
+ return res;
+ }
+
this.name = name;
this.len = strlen(name);
this.hash = 0; /* will go */
- sb = mnt->mnt_sb;
path.mnt = mntget(mnt);
path.dentry = d_alloc_pseudo(sb, &this);
- if (!path.dentry)
- goto put_memory;
+ if (!path.dentry) {
+ iput(inode);
+ return ERR_PTR(-ENOMEM);
+ }
d_set_d_op(path.dentry, &anon_ops);
- res = ERR_PTR(-ENOSPC);
- inode = shmem_get_inode(sb, NULL, S_IFREG | 0777, 0, flags);
- if (!inode)
- goto put_memory;
-
- inode->i_flags |= i_flags;
d_instantiate(path.dentry, inode);
- inode->i_size = size;
- clear_nlink(inode); /* It is unlinked */
- res = ERR_PTR(ramfs_nommu_expand_for_mapping(inode, size));
- if (IS_ERR(res))
- goto put_path;
res = alloc_file(&path, FMODE_WRITE | FMODE_READ,
&shmem_file_operations);
if (IS_ERR(res))
- goto put_path;
-
- return res;
-
-put_memory:
- shmem_unacct_size(flags, size);
-put_path:
- path_put(&path);
+ path_put(&path);
return res;
}
--
2.11.0
next prev parent reply other threads:[~2018-07-11 2:21 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20180710101736.32d6cc6c@canb.auug.org.au>
[not found] ` <20180710150455.GK30522@ZenIV.linux.org.uk>
2018-07-11 2:11 ` linux-next: manual merge of the vfs tree with the overlayfs tree Al Viro
2018-07-11 2:21 ` [RFC][PATCH 01/42] drm_mode_create_lease_ioctl(): fix open-coded filp_clone_open() Al Viro
2018-07-11 2:21 ` [RFC][PATCH 02/42] cxl_getfile(): fix double-iput() on alloc_file() failures Al Viro
2018-07-11 2:21 ` [RFC][PATCH 03/42] ocxlflash_getfile(): " Al Viro
2018-07-11 2:21 ` [RFC][PATCH 04/42] make get_empty_filp() to call file_free_rcu() directly Al Viro
2018-07-11 2:35 ` Linus Torvalds
2018-07-11 2:43 ` Al Viro
2018-07-11 2:21 ` [RFC][PATCH 05/42] fold security_file_free() into file_free() Al Viro
2018-07-11 2:21 ` [RFC][PATCH 06/42] turn filp_clone_open() into inline wrapper for dentry_open() Al Viro
2018-07-11 2:21 ` [RFC][PATCH 07/42] create_pipe_files(): use fput() if allocation of the second file fails Al Viro
2018-07-11 2:21 ` [RFC][PATCH 08/42] make sure do_dentry_open() won't return positive as an error Al Viro
2018-07-11 2:39 ` Linus Torvalds
2018-07-11 2:41 ` Al Viro
2018-07-11 2:21 ` [RFC][PATCH 09/42] pass creds to get_empty_filp(), make sure dentry_open() passes the right creds Al Viro
2018-07-11 2:21 ` [RFC][PATCH 10/42] get rid of cred argument of vfs_open() and do_dentry_open() Al Viro
2018-07-11 2:21 ` [RFC][PATCH 11/42] security_file_open(): lose cred argument Al Viro
2018-07-11 2:21 ` [RFC][PATCH 12/42] ->file_open(): " Al Viro
2018-07-11 2:21 ` [RFC][PATCH 13/42] introduce FMODE_OPENED Al Viro
2018-07-11 2:21 ` [RFC][PATCH 14/42] fold put_filp() into fput() Al Viro
2018-07-11 2:21 ` [RFC][PATCH 15/42] lift fput() on late failures into path_openat() Al Viro
2018-07-11 5:43 ` Amir Goldstein
2018-07-11 2:21 ` [RFC][PATCH 16/42] now we can fold open_check_o_direct() into do_dentry_open() Al Viro
2018-07-11 2:44 ` Linus Torvalds
2018-07-11 2:59 ` Al Viro
2018-07-11 3:13 ` Linus Torvalds
2018-07-11 2:21 ` [RFC][PATCH 17/42] switch all remaining checks for FILE_OPENED to FMODE_OPENED Al Viro
2018-07-11 2:21 ` [RFC][PATCH 18/42] introduce FMODE_CREATED and switch to it Al Viro
2018-07-11 2:21 ` [RFC][PATCH 19/42] IMA: don't propagate opened through the entire thing Al Viro
2018-07-11 2:21 ` [RFC][PATCH 20/42] getting rid of 'opened' argument of ->atomic_open() - step 1 Al Viro
2018-07-11 2:21 ` [RFC][PATCH 21/42] getting rid of 'opened' argument of ->atomic_open() - part 2 Al Viro
2018-07-11 2:21 ` [RFC][PATCH 22/42] get rid of 'opened' argument of ->atomic_open() - part 3 Al Viro
2018-07-11 2:21 ` [RFC][PATCH 23/42] get rid of 'opened' in path_openat() and the helpers downstream Al Viro
2018-07-11 2:21 ` [RFC][PATCH 24/42] ->atomic_open(): return 0 in all success cases Al Viro
2018-07-11 2:21 ` [RFC][PATCH 25/42] document ->atomic_open() changes Al Viro
2018-07-11 2:21 ` [RFC][PATCH 26/42] switch atomic_open() and lookup_open() to returning 0 in all success cases Al Viro
2018-07-11 2:21 ` [RFC][PATCH 27/42] kill FILE_{CREATED,OPENED} Al Viro
2018-07-11 2:21 ` [RFC][PATCH 28/42] new wrapper: alloc_file_pseudo() Al Viro
2018-07-11 2:21 ` Al Viro [this message]
2018-07-11 2:21 ` [RFC][PATCH 30/42] ... and switch shmem_file_setup() to alloc_file_pseudo() Al Viro
2018-07-11 2:21 ` [RFC][PATCH 31/42] cxl_getfile(): switch " Al Viro
2018-07-11 2:21 ` [RFC][PATCH 32/42] ocxlflash_getfile(): " Al Viro
2018-07-11 2:21 ` [RFC][PATCH 33/42] hugetlb_file_setup(): " Al Viro
2018-07-11 2:21 ` [RFC][PATCH 34/42] anon_inode_getfile(): " Al Viro
2018-07-11 2:21 ` [RFC][PATCH 35/42] create_pipe_files(): switch the first allocation " Al Viro
2018-07-11 2:22 ` [RFC][PATCH 36/42] new helper: alloc_file_clone() Al Viro
2018-07-11 2:22 ` [RFC][PATCH 37/42] do_shmat(): grab shp->shm_file earlier, switch to alloc_file_clone() Al Viro
2018-07-11 2:22 ` [RFC][PATCH 38/42] make alloc_file() static Al Viro
2018-07-11 2:22 ` [RFC][PATCH 39/42] document alloc_file() changes Al Viro
2018-07-11 2:22 ` [RFC][PATCH 40/42] make path_init() unconditionally paired with terminate_walk() Al Viro
2018-07-11 2:22 ` [RFC][PATCH 41/42] allow link_path_walk() to take ERR_PTR() Al Viro
2018-07-11 2:22 ` [RFC][PATCH 42/42] few more cleanups of link_path_walk() callers Al Viro
2018-07-11 2:56 ` [RFC][PATCH 01/42] drm_mode_create_lease_ioctl(): fix open-coded filp_clone_open() Linus Torvalds
2018-07-11 15:25 ` Al Viro
2018-07-11 16:15 ` Al Viro
2018-07-12 12:43 ` Al Viro
2018-07-12 15:05 ` Linus Torvalds
2018-07-12 15:53 ` vfs / overlayfs conflict resolution for linux-next Al Viro
2018-07-18 2:56 ` Al Viro
2018-07-18 3:29 ` Stephen Rothwell
2018-07-18 7:25 ` Miklos Szeredi
2018-07-18 12:10 ` Miklos Szeredi
2018-07-18 12:43 ` Al Viro
2018-07-18 13:46 ` Al Viro
2018-07-18 15:46 ` Miklos Szeredi
2018-07-18 18:12 ` [RFC] call_with_creds() Al Viro
2018-07-18 18:19 ` Linus Torvalds
2018-07-18 19:46 ` Al Viro
2018-07-18 19:53 ` Linus Torvalds
2018-07-18 20:04 ` Al Viro
2018-07-18 20:15 ` Al Viro
2018-07-18 20:43 ` Linus Torvalds
2018-07-18 21:22 ` Al Viro
2018-07-18 23:06 ` Linus Torvalds
2018-07-18 21:27 ` David Howells
2018-07-18 23:16 ` Linus Torvalds
2018-07-18 21:28 ` David Howells
2018-07-18 23:13 ` Linus Torvalds
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