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NFS: Improve tracing of permission calls 

On exit from nfs_do_access(), record the mask representing the requested
permissions, as well as the server-supplied set of access rights for
this user.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2020-01-06 15:25:12 -05:00 committed by Anna Schumaker
parent 088f3e68d8
commit e8194b7dd3
2 changed files with 62 additions and 3 deletions
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4
fs/nfs/dir.c
View File

@ -2476,7 +2476,7 @@ static int nfs_do_access(struct inode *inode, const struct cred *cred, int mask)
{
struct nfs_access_entry cache;
bool may_block = (mask & MAY_NOT_BLOCK) == 0;
int cache_mask;
int cache_mask = -1;
int status;
trace_nfs_access_enter(inode);
@ -2515,7 +2515,7 @@ out_cached:
if ((mask & ~cache_mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0)
status = -EACCES;
out:
trace_nfs_access_exit(inode, status);
trace_nfs_access_exit(inode, mask, cache_mask, status);
return status;
}

61
fs/nfs/nfstrace.h
View File

@ -198,7 +198,66 @@ DEFINE_NFS_INODE_EVENT_DONE(nfs_writeback_inode_exit);
DEFINE_NFS_INODE_EVENT(nfs_fsync_enter);
DEFINE_NFS_INODE_EVENT_DONE(nfs_fsync_exit);
DEFINE_NFS_INODE_EVENT(nfs_access_enter);
DEFINE_NFS_INODE_EVENT_DONE(nfs_access_exit);
TRACE_EVENT(nfs_access_exit,
TP_PROTO(
const struct inode *inode,
unsigned int mask,
unsigned int permitted,
int error
),
TP_ARGS(inode, mask, permitted, error),
TP_STRUCT__entry(
__field(unsigned long, error)
__field(dev_t, dev)
__field(u32, fhandle)
__field(unsigned char, type)
__field(u64, fileid)
__field(u64, version)
__field(loff_t, size)
__field(unsigned long, nfsi_flags)
__field(unsigned long, cache_validity)
__field(unsigned int, mask)
__field(unsigned int, permitted)
),
TP_fast_assign(
const struct nfs_inode *nfsi = NFS_I(inode);
__entry->error = error < 0 ? -error : 0;
__entry->dev = inode->i_sb->s_dev;
__entry->fileid = nfsi->fileid;
__entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
__entry->type = nfs_umode_to_dtype(inode->i_mode);
__entry->version = inode_peek_iversion_raw(inode);
__entry->size = i_size_read(inode);
__entry->nfsi_flags = nfsi->flags;
__entry->cache_validity = nfsi->cache_validity;
__entry->mask = mask;
__entry->permitted = permitted;
),
TP_printk(
"error=%ld (%s) fileid=%02x:%02x:%llu fhandle=0x%08x "
"type=%u (%s) version=%llu size=%lld "
"cache_validity=0x%lx (%s) nfs_flags=0x%lx (%s) "
"mask=0x%x permitted=0x%x",
-__entry->error, nfs_show_status(__entry->error),
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long long)__entry->fileid,
__entry->fhandle,
__entry->type,
nfs_show_file_type(__entry->type),
(unsigned long long)__entry->version,
(long long)__entry->size,
__entry->cache_validity,
nfs_show_cache_validity(__entry->cache_validity),
__entry->nfsi_flags,
nfs_show_nfsi_flags(__entry->nfsi_flags),
__entry->mask, __entry->permitted
)
);
TRACE_DEFINE_ENUM(LOOKUP_FOLLOW);
TRACE_DEFINE_ENUM(LOOKUP_DIRECTORY);