diff options
Diffstat (limited to 'sys/dev/filemon/filemon_wrapper.c')
| -rw-r--r-- | sys/dev/filemon/filemon_wrapper.c | 150 |
1 files changed, 9 insertions, 141 deletions
diff --git a/sys/dev/filemon/filemon_wrapper.c b/sys/dev/filemon/filemon_wrapper.c index 4a1259a..d107a40 100644 --- a/sys/dev/filemon/filemon_wrapper.c +++ b/sys/dev/filemon/filemon_wrapper.c @@ -1,6 +1,7 @@ /*- * Copyright (c) 2011, David E. O'Brien. * Copyright (c) 2009-2011, Juniper Networks, Inc. + * Copyright (c) 2015, EMC Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -86,17 +87,25 @@ filemon_pid_check(struct proc *p) { struct filemon *filemon; + filemon_lock_read(); + if (TAILQ_EMPTY(&filemons_inuse)) { + filemon_unlock_read(); + return (NULL); + } sx_slock(&proctree_lock); while (p != initproc) { TAILQ_FOREACH(filemon, &filemons_inuse, link) { if (p->p_pid == filemon->pid) { sx_sunlock(&proctree_lock); + filemon_filemon_lock(filemon); + filemon_unlock_read(); return (filemon); } } p = proc_realparent(p); } sx_sunlock(&proctree_lock); + filemon_unlock_read(); return (NULL); } @@ -109,9 +118,6 @@ filemon_comment(struct filemon *filemon) /* Load timestamp before locking. Less accurate but less contention. */ getmicrotime(&now); - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - /* Lock the found filemon structure. */ filemon_filemon_lock(filemon); @@ -124,9 +130,6 @@ filemon_comment(struct filemon *filemon) /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); - - /* Release the read lock. */ - filemon_unlock_read(); } static int @@ -138,13 +141,7 @@ filemon_wrapper_chdir(struct thread *td, struct chdir_args *uap) struct filemon *filemon; if ((ret = sys_chdir(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - copyinstr(uap->path, filemon->fname1, sizeof(filemon->fname1), &done); @@ -157,9 +154,6 @@ filemon_wrapper_chdir(struct thread *td, struct chdir_args *uap) /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); @@ -177,13 +171,7 @@ filemon_wrapper_execve(struct thread *td, struct execve_args *uap) copyinstr(uap->fname, fname, sizeof(fname), &done); if ((ret = sys_execve(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - len = snprintf(filemon->msgbufr, sizeof(filemon->msgbufr), "E %d %s\n", curproc->p_pid, fname); @@ -193,9 +181,6 @@ filemon_wrapper_execve(struct thread *td, struct execve_args *uap) /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); @@ -215,13 +200,7 @@ filemon_wrapper_freebsd32_execve(struct thread *td, copyinstr(uap->fname, fname, sizeof(fname), &done); if ((ret = freebsd32_execve(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - len = snprintf(filemon->msgbufr, sizeof(filemon->msgbufr), "E %d %s\n", curproc->p_pid, fname); @@ -231,9 +210,6 @@ filemon_wrapper_freebsd32_execve(struct thread *td, /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); @@ -248,13 +224,7 @@ filemon_wrapper_fork(struct thread *td, struct fork_args *uap) struct filemon *filemon; if ((ret = sys_fork(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - len = snprintf(filemon->msgbufr, sizeof(filemon->msgbufr), "F %d %ld\n", curproc->p_pid, (long)curthread->td_retval[0]); @@ -264,9 +234,6 @@ filemon_wrapper_fork(struct thread *td, struct fork_args *uap) /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); @@ -281,13 +248,7 @@ filemon_wrapper_open(struct thread *td, struct open_args *uap) struct filemon *filemon; if ((ret = sys_open(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - copyinstr(uap->path, filemon->fname1, sizeof(filemon->fname1), &done); @@ -313,9 +274,6 @@ filemon_wrapper_open(struct thread *td, struct open_args *uap) /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); @@ -330,13 +288,7 @@ filemon_wrapper_openat(struct thread *td, struct openat_args *uap) struct filemon *filemon; if ((ret = sys_openat(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - copyinstr(uap->path, filemon->fname1, sizeof(filemon->fname1), &done); @@ -375,9 +327,6 @@ filemon_wrapper_openat(struct thread *td, struct openat_args *uap) /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); @@ -392,13 +341,7 @@ filemon_wrapper_rename(struct thread *td, struct rename_args *uap) struct filemon *filemon; if ((ret = sys_rename(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - copyinstr(uap->from, filemon->fname1, sizeof(filemon->fname1), &done); copyinstr(uap->to, filemon->fname2, @@ -413,9 +356,6 @@ filemon_wrapper_rename(struct thread *td, struct rename_args *uap) /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); @@ -430,13 +370,7 @@ filemon_wrapper_link(struct thread *td, struct link_args *uap) struct filemon *filemon; if ((ret = sys_link(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - copyinstr(uap->path, filemon->fname1, sizeof(filemon->fname1), &done); copyinstr(uap->link, filemon->fname2, @@ -451,9 +385,6 @@ filemon_wrapper_link(struct thread *td, struct link_args *uap) /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); @@ -468,13 +399,7 @@ filemon_wrapper_symlink(struct thread *td, struct symlink_args *uap) struct filemon *filemon; if ((ret = sys_symlink(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - copyinstr(uap->path, filemon->fname1, sizeof(filemon->fname1), &done); copyinstr(uap->link, filemon->fname2, @@ -489,9 +414,6 @@ filemon_wrapper_symlink(struct thread *td, struct symlink_args *uap) /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); @@ -507,13 +429,7 @@ filemon_wrapper_linkat(struct thread *td, struct linkat_args *uap) struct filemon *filemon; if ((ret = sys_linkat(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - copyinstr(uap->path1, filemon->fname1, sizeof(filemon->fname1), &done); copyinstr(uap->path2, filemon->fname2, @@ -528,9 +444,6 @@ filemon_wrapper_linkat(struct thread *td, struct linkat_args *uap) /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); @@ -546,13 +459,7 @@ filemon_wrapper_stat(struct thread *td, struct stat_args *uap) struct filemon *filemon; if ((ret = sys_stat(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - copyinstr(uap->path, filemon->fname1, sizeof(filemon->fname1), &done); @@ -565,9 +472,6 @@ filemon_wrapper_stat(struct thread *td, struct stat_args *uap) /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); @@ -584,13 +488,7 @@ filemon_wrapper_freebsd32_stat(struct thread *td, struct filemon *filemon; if ((ret = freebsd32_stat(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - copyinstr(uap->path, filemon->fname1, sizeof(filemon->fname1), &done); @@ -603,9 +501,6 @@ filemon_wrapper_freebsd32_stat(struct thread *td, /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); @@ -622,13 +517,7 @@ filemon_wrapper_sys_exit(struct thread *td, struct sys_exit_args *uap) /* Get timestamp before locking. */ getmicrotime(&now); - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - len = snprintf(filemon->msgbufr, sizeof(filemon->msgbufr), "X %d %d\n", curproc->p_pid, uap->rval); @@ -649,9 +538,6 @@ filemon_wrapper_sys_exit(struct thread *td, struct sys_exit_args *uap) filemon_filemon_unlock(filemon); } - /* Release the read lock. */ - filemon_unlock_read(); - sys_sys_exit(td, uap); } @@ -664,13 +550,7 @@ filemon_wrapper_unlink(struct thread *td, struct unlink_args *uap) struct filemon *filemon; if ((ret = sys_unlink(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - copyinstr(uap->path, filemon->fname1, sizeof(filemon->fname1), &done); @@ -683,9 +563,6 @@ filemon_wrapper_unlink(struct thread *td, struct unlink_args *uap) /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); @@ -699,13 +576,7 @@ filemon_wrapper_vfork(struct thread *td, struct vfork_args *uap) struct filemon *filemon; if ((ret = sys_vfork(td, uap)) == 0) { - /* Grab a read lock on the filemon inuse list. */ - filemon_lock_read(); - if ((filemon = filemon_pid_check(curproc)) != NULL) { - /* Lock the found filemon structure. */ - filemon_filemon_lock(filemon); - len = snprintf(filemon->msgbufr, sizeof(filemon->msgbufr), "F %d %ld\n", curproc->p_pid, (long)curthread->td_retval[0]); @@ -715,9 +586,6 @@ filemon_wrapper_vfork(struct thread *td, struct vfork_args *uap) /* Unlock the found filemon structure. */ filemon_filemon_unlock(filemon); } - - /* Release the read lock. */ - filemon_unlock_read(); } return (ret); |
