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shmem: fix double uncharge in __shmem_file_setup() 

If __shmem_file_setup() fails on struct file allocation it uncharges
memory commitment twice: first by shmem_unacct_size() and second time
implicitly in shmem_evict_inode() when it kills the newly created inode.

This patch removes shmem_unacct_size() from error path if the inode was
already there.

Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Konstantin Khlebnikov 2014-08-06 16:06:32 -07:00 committed by Linus Torvalds
parent ef6b571fb8
commit 66ee4b8887
1 changed files with 6 additions and 6 deletions
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12
mm/shmem.c
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@ -2932,16 +2932,16 @@ static struct file *__shmem_file_setup(const char *name, loff_t size,
this.len = strlen(name); this.len = strlen(name);
this.hash = 0; /* will go */ this.hash = 0; /* will go */
sb = shm_mnt->mnt_sb; sb = shm_mnt->mnt_sb;
path.mnt = mntget(shm_mnt);
path.dentry = d_alloc_pseudo(sb, &this); path.dentry = d_alloc_pseudo(sb, &this);
if (!path.dentry) if (!path.dentry)
goto put_memory; goto put_memory;
d_set_d_op(path.dentry, &anon_ops); d_set_d_op(path.dentry, &anon_ops);
path.mnt = mntget(shm_mnt);
res = ERR_PTR(-ENOSPC); res = ERR_PTR(-ENOSPC);
inode = shmem_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0, flags); inode = shmem_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0, flags);
if (!inode) if (!inode)
goto put_dentry; goto put_memory;
inode->i_flags |= i_flags; inode->i_flags |= i_flags;
d_instantiate(path.dentry, inode); d_instantiate(path.dentry, inode);
@ -2949,19 +2949,19 @@ static struct file *__shmem_file_setup(const char *name, loff_t size,
clear_nlink(inode); /* It is unlinked */ clear_nlink(inode); /* It is unlinked */
res = ERR_PTR(ramfs_nommu_expand_for_mapping(inode, size)); res = ERR_PTR(ramfs_nommu_expand_for_mapping(inode, size));
if (IS_ERR(res)) if (IS_ERR(res))
goto put_dentry; goto put_path;
res = alloc_file(&path, FMODE_WRITE | FMODE_READ, res = alloc_file(&path, FMODE_WRITE | FMODE_READ,
&shmem_file_operations); &shmem_file_operations);
if (IS_ERR(res)) if (IS_ERR(res))
goto put_dentry; goto put_path;
return res; return res;
put_dentry:
path_put(&path);
put_memory: put_memory:
shmem_unacct_size(flags, size); shmem_unacct_size(flags, size);
put_path:
path_put(&path);
return res; return res;
} }