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author | Al Viro <viro@zeniv.linux.org.uk> | 2018-06-09 09:27:41 -0400 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2018-07-12 10:04:24 -0400 |
commit | dac2d1f6cbfe3f63867a601d2431b7749d9bdbcf (patch) | |
tree | 7e8c34a523f5f9749dc42f055ca8eee91e1488e0 | |
parent | d93aa9d82aea80b80f225dbf9c7986df444d8106 (diff) | |
download | linux-dac2d1f6cbfe3f63867a601d2431b7749d9bdbcf.tar.gz linux-dac2d1f6cbfe3f63867a601d2431b7749d9bdbcf.tar.bz2 linux-dac2d1f6cbfe3f63867a601d2431b7749d9bdbcf.zip |
__shmem_file_setup(): reorder allocations
grab inode and reserve memory first.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r-- | mm/shmem.c | 43 |
1 files changed, 20 insertions, 23 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index 84844e52bf24..35aabed7d64d 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -3918,40 +3918,37 @@ 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, O_RDWR, &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; } |