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f2fs: introduce data read/write showing path info

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This was used in Android for a long time. Let's upstream it.

Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2022-03-21 15:13:06 -07:00
parent c2ca36e82f
commit c277f1411d
2 changed files with 145 additions and 7 deletions
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58
fs/f2fs/file.c
View File

@ -4329,17 +4329,39 @@ out:
static ssize_t f2fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
{
struct inode *inode = file_inode(iocb->ki_filp);
const loff_t pos = iocb->ki_pos;
ssize_t ret;
if (!f2fs_is_compress_backend_ready(inode))
return -EOPNOTSUPP;
if (f2fs_should_use_dio(inode, iocb, to))
return f2fs_dio_read_iter(iocb, to);
if (trace_f2fs_dataread_start_enabled()) {
char *p = f2fs_kmalloc(F2FS_I_SB(inode), PATH_MAX, GFP_KERNEL);
char *path;
ret = filemap_read(iocb, to, 0);
if (ret > 0)
f2fs_update_iostat(F2FS_I_SB(inode), APP_BUFFERED_READ_IO, ret);
if (!p)
goto skip_read_trace;
path = dentry_path_raw(file_dentry(iocb->ki_filp), p, PATH_MAX);
if (IS_ERR(path)) {
kfree(p);
goto skip_read_trace;
}
trace_f2fs_dataread_start(inode, pos, iov_iter_count(to),
current->pid, path, current->comm);
kfree(p);
}
skip_read_trace:
if (f2fs_should_use_dio(inode, iocb, to)) {
ret = f2fs_dio_read_iter(iocb, to);
} else {
ret = filemap_read(iocb, to, 0);
if (ret > 0)
f2fs_update_iostat(F2FS_I_SB(inode), APP_BUFFERED_READ_IO, ret);
}
if (trace_f2fs_dataread_end_enabled())
trace_f2fs_dataread_end(inode, pos, ret);
return ret;
}
@ -4631,14 +4653,36 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
/* Possibly preallocate the blocks for the write. */
target_size = iocb->ki_pos + iov_iter_count(from);
preallocated = f2fs_preallocate_blocks(iocb, from, dio);
if (preallocated < 0)
if (preallocated < 0) {
ret = preallocated;
else
} else {
if (trace_f2fs_datawrite_start_enabled()) {
char *p = f2fs_kmalloc(F2FS_I_SB(inode),
PATH_MAX, GFP_KERNEL);
char *path;
if (!p)
goto skip_write_trace;
path = dentry_path_raw(file_dentry(iocb->ki_filp),
p, PATH_MAX);
if (IS_ERR(path)) {
kfree(p);
goto skip_write_trace;
}
trace_f2fs_datawrite_start(inode, orig_pos, orig_count,
current->pid, path, current->comm);
kfree(p);
}
skip_write_trace:
/* Do the actual write. */
ret = dio ?
f2fs_dio_write_iter(iocb, from, &may_need_sync):
f2fs_buffered_write_iter(iocb, from);
if (trace_f2fs_datawrite_end_enabled())
trace_f2fs_datawrite_end(inode, orig_pos, ret);
}
/* Don't leave any preallocated blocks around past i_size. */
if (preallocated && i_size_read(inode) < target_size) {
f2fs_down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);

94
include/trace/events/f2fs.h
View File

@ -2067,6 +2067,100 @@ TRACE_EVENT(f2fs_fiemap,
__entry->ret)
);
DECLARE_EVENT_CLASS(f2fs__rw_start,
TP_PROTO(struct inode *inode, loff_t offset, int bytes,
pid_t pid, char *pathname, char *command),
TP_ARGS(inode, offset, bytes, pid, pathname, command),
TP_STRUCT__entry(
__string(pathbuf, pathname)
__field(loff_t, offset)
__field(int, bytes)
__field(loff_t, i_size)
__string(cmdline, command)
__field(pid_t, pid)
__field(ino_t, ino)
),
TP_fast_assign(
/*
* Replace the spaces in filenames and cmdlines
* because this screws up the tooling that parses
* the traces.
*/
__assign_str(pathbuf, pathname);
(void)strreplace(__get_str(pathbuf), ' ', '_');
__entry->offset = offset;
__entry->bytes = bytes;
__entry->i_size = i_size_read(inode);
__assign_str(cmdline, command);
(void)strreplace(__get_str(cmdline), ' ', '_');
__entry->pid = pid;
__entry->ino = inode->i_ino;
),
TP_printk("entry_name %s, offset %llu, bytes %d, cmdline %s,"
" pid %d, i_size %llu, ino %lu",
__get_str(pathbuf), __entry->offset, __entry->bytes,
__get_str(cmdline), __entry->pid, __entry->i_size,
(unsigned long) __entry->ino)
);
DECLARE_EVENT_CLASS(f2fs__rw_end,
TP_PROTO(struct inode *inode, loff_t offset, int bytes),
TP_ARGS(inode, offset, bytes),
TP_STRUCT__entry(
__field(ino_t, ino)
__field(loff_t, offset)
__field(int, bytes)
),
TP_fast_assign(
__entry->ino = inode->i_ino;
__entry->offset = offset;
__entry->bytes = bytes;
),
TP_printk("ino %lu, offset %llu, bytes %d",
(unsigned long) __entry->ino,
__entry->offset, __entry->bytes)
);
DEFINE_EVENT(f2fs__rw_start, f2fs_dataread_start,
TP_PROTO(struct inode *inode, loff_t offset, int bytes,
pid_t pid, char *pathname, char *command),
TP_ARGS(inode, offset, bytes, pid, pathname, command)
);
DEFINE_EVENT(f2fs__rw_end, f2fs_dataread_end,
TP_PROTO(struct inode *inode, loff_t offset, int bytes),
TP_ARGS(inode, offset, bytes)
);
DEFINE_EVENT(f2fs__rw_start, f2fs_datawrite_start,
TP_PROTO(struct inode *inode, loff_t offset, int bytes,
pid_t pid, char *pathname, char *command),
TP_ARGS(inode, offset, bytes, pid, pathname, command)
);
DEFINE_EVENT(f2fs__rw_end, f2fs_datawrite_end,
TP_PROTO(struct inode *inode, loff_t offset, int bytes),
TP_ARGS(inode, offset, bytes)
);
#endif /* _TRACE_F2FS_H */
/* This part must be outside protection */