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fault-injection: add ability to export fault_attr in arbitrary directory

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init_fault_attr_dentries() is used to export fault_attr via debugfs.
But it can only export it in debugfs root directory.

Per Forlin is working on mmc_fail_request which adds support to inject
data errors after a completed host transfer in MMC subsystem.

The fault_attr for mmc_fail_request should be defined per mmc host and
export it in debugfs directory per mmc host like
/sys/kernel/debug/mmc0/mmc_fail_request.

init_fault_attr_dentries() doesn't help for mmc_fail_request.  So this
introduces fault_create_debugfs_attr() which is able to create a
directory in the arbitrary directory and replace
init_fault_attr_dentries().

[[email protected]: extraneous semicolon, per Randy]
Signed-off-by: Akinobu Mita <[email protected]>
Tested-by: Per Forlin <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Matt Mackall <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Akinobu Mita 2011-08-03 16:21:01 -07:00 • committed by Linus Torvalds
commit dd48c085c1
7 changed files with 33 additions and 46 deletions
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20
lib/fault-inject.c
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@ -197,21 +197,15 @@ static struct dentry *debugfs_create_atomic_t(const char *name, mode_t mode,
return debugfs_create_file(name, mode, parent, value, &fops_atomic_t);
}
void cleanup_fault_attr_dentries(struct fault_attr *attr)
{
debugfs_remove_recursive(attr->dir);
}
int init_fault_attr_dentries(struct fault_attr *attr, const char *name)
struct dentry *fault_create_debugfs_attr(const char *name,
struct dentry *parent, struct fault_attr *attr)
{
mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
struct dentry *dir;
dir = debugfs_create_dir(name, NULL);
dir = debugfs_create_dir(name, parent);
if (!dir)
return -ENOMEM;
attr->dir = dir;
return ERR_PTR(-ENOMEM);
if (!debugfs_create_ul("probability", mode, dir, &attr->probability))
goto fail;
@ -243,11 +237,11 @@ int init_fault_attr_dentries(struct fault_attr *attr, const char *name)
#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
return 0;
return dir;
fail:
debugfs_remove_recursive(attr->dir);
debugfs_remove_recursive(dir);
return -ENOMEM;
return ERR_PTR(-ENOMEM);
}
#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */