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fs: Preserve error code in get_empty_filp(), part 2

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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 <[email protected]>
Reviewed-by: "Theodore Ts'o" <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Anatol Pomozov 2012-09-12 20:11:55 -07:00 • committed by Al Viro
commit 39b6525274
8 changed files with 19 additions and 22 deletions
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3
ipc/shm.c
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@ -1042,7 +1042,8 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
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;