fs: Preserve error code in get_empty_filp(), part 2
Allocating a file structure in function get_empty_filp() might fail because
of several reasons:
- not enough memory for file structures
- operation is not allowed
- user is over its limit
Currently the function returns NULL in all cases and we loose the exact
reason of the error. All callers of get_empty_filp() assume that the function
can fail with ENFILE only.
Return error through pointer. Change all callers to preserve this error code.
[AV: cleaned up a bit, carved the get_empty_filp() part out into a separate commit
(things remaining here deal with alloc_file()), removed pipe(2) behaviour change]
Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Reviewed-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index ea39eba..433f5e8 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -2221,9 +2221,9 @@
d_add(path.dentry, inode);
file = alloc_file(&path, FMODE_READ, &pfm_file_ops);
- if (!file) {
+ if (IS_ERR(file)) {
path_put(&path);
- return ERR_PTR(-ENFILE);
+ return file;
}
file->f_flags = O_RDONLY;
diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 28d39fb..a14eb0c 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -131,7 +131,6 @@
struct qstr this;
struct path path;
struct file *file;
- int error;
if (IS_ERR(anon_inode_inode))
return ERR_PTR(-ENODEV);
@@ -143,7 +142,7 @@
* Link the inode to a directory entry by creating a unique name
* using the inode sequence number.
*/
- error = -ENOMEM;
+ file = ERR_PTR(-ENOMEM);
this.name = name;
this.len = strlen(name);
this.hash = 0;
@@ -160,9 +159,8 @@
d_instantiate(path.dentry, anon_inode_inode);
- error = -ENFILE;
file = alloc_file(&path, OPEN_FMODE(flags), fops);
- if (!file)
+ if (IS_ERR(file))
goto err_dput;
file->f_mapping = anon_inode_inode->i_mapping;
@@ -177,7 +175,7 @@
path_put(&path);
err_module:
module_put(fops->owner);
- return ERR_PTR(error);
+ return file;
}
EXPORT_SYMBOL_GPL(anon_inode_getfile);
diff --git a/fs/file_table.c b/fs/file_table.c
index cd76d4f..aa07d36 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -173,7 +173,7 @@
file = get_empty_filp();
if (IS_ERR(file))
- return NULL;
+ return file;
file->f_path = *path;
file->f_mapping = path->dentry->d_inode->i_mapping;
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index edb42ea..99fe7ef 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -923,8 +923,7 @@
struct user_struct **user,
int creat_flags, int page_size_log)
{
- int error = -ENOMEM;
- struct file *file;
+ struct file *file = ERR_PTR(-ENOMEM);
struct inode *inode;
struct path path;
struct dentry *root;
@@ -964,7 +963,7 @@
goto out_shm_unlock;
path.mnt = mntget(hugetlbfs_vfsmount[hstate_idx]);
- error = -ENOSPC;
+ file = ERR_PTR(-ENOSPC);
inode = hugetlbfs_get_inode(root->d_sb, NULL, S_IFREG | S_IRWXUGO, 0);
if (!inode)
goto out_dentry;
@@ -973,7 +972,7 @@
size += addr & ~huge_page_mask(hstate);
num_pages = ALIGN(size, huge_page_size(hstate)) >>
huge_page_shift(hstate);
- error = -ENOMEM;
+ file = ERR_PTR(-ENOMEM);
if (hugetlb_reserve_pages(inode, 0, num_pages, NULL, acctflag))
goto out_inode;
@@ -981,10 +980,9 @@
inode->i_size = size;
clear_nlink(inode);
- error = -ENFILE;
file = alloc_file(&path, FMODE_WRITE | FMODE_READ,
&hugetlbfs_file_operations);
- if (!file)
+ if (IS_ERR(file))
goto out_dentry; /* inode is already attached */
return file;
@@ -998,7 +996,7 @@
user_shm_unlock(size, *user);
*user = NULL;
}
- return ERR_PTR(error);
+ return file;
}
static int __init init_hugetlbfs_fs(void)
diff --git a/fs/pipe.c b/fs/pipe.c
index 39baf6c..64a494c 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -1037,13 +1037,13 @@
err = -ENFILE;
f = alloc_file(&path, FMODE_WRITE, &write_pipefifo_fops);
- if (!f)
+ if (IS_ERR(f))
goto err_dentry;
f->f_flags = O_WRONLY | (flags & (O_NONBLOCK | O_DIRECT));
res[0] = alloc_file(&path, FMODE_READ, &read_pipefifo_fops);
- if (!res[0])
+ if (IS_ERR(res[0]))
goto err_file;
path_get(&path);
diff --git a/ipc/shm.c b/ipc/shm.c
index 8c9402d..de389e6 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -1042,7 +1042,8 @@
is_file_hugepages(shp->shm_file) ?
&shm_file_operations_huge :
&shm_file_operations);
- if (!file)
+ err = PTR_ERR(file);
+ if (IS_ERR(file))
goto out_free;
file->private_data = sfd;
diff --git a/mm/shmem.c b/mm/shmem.c
index 814d554..abf07f7 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2913,10 +2913,10 @@
goto put_dentry;
#endif
- error = -ENFILE;
file = alloc_file(&path, FMODE_WRITE | FMODE_READ,
&shmem_file_operations);
- if (!file)
+ error = PTR_ERR(file);
+ if (IS_ERR(file))
goto put_dentry;
return file;
diff --git a/net/socket.c b/net/socket.c
index 2ca51c7..f4a8c5a 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -370,11 +370,11 @@
file = alloc_file(&path, FMODE_READ | FMODE_WRITE,
&socket_file_ops);
- if (unlikely(!file)) {
+ if (unlikely(IS_ERR(file))) {
/* drop dentry, keep inode */
ihold(path.dentry->d_inode);
path_put(&path);
- return ERR_PTR(-ENFILE);
+ return file;
}
sock->file = file;