diff options
Diffstat (limited to 'usr/src/uts/common/io/lofi.c')
| -rw-r--r-- | usr/src/uts/common/io/lofi.c | 49 |
1 files changed, 42 insertions, 7 deletions
diff --git a/usr/src/uts/common/io/lofi.c b/usr/src/uts/common/io/lofi.c index 049a0235fd..5229e680ff 100644 --- a/usr/src/uts/common/io/lofi.c +++ b/usr/src/uts/common/io/lofi.c @@ -20,6 +20,8 @@ */ /* * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. + * + * Copyright 2013 Nexenta Systems, Inc. All rights reserved. */ /* @@ -478,6 +480,11 @@ lofi_open(dev_t *devp, int flag, int otyp, struct cred *credp) return (EINVAL); } + if (lsp->ls_readonly && (flag & FWRITE)) { + mutex_exit(&lofi_lock); + return (EROFS); + } + mutex_exit(&lofi_lock); return (0); } @@ -1620,11 +1627,13 @@ lofi_access(struct lofi_state *lsp) * allow the global zone visibility into NGZ lofi nodes. */ static int -file_to_lofi_nocheck(char *filename, struct lofi_state **lspp) +file_to_lofi_nocheck(char *filename, boolean_t readonly, + struct lofi_state **lspp) { struct lofi_state *lsp; vnode_t *vp = NULL; int err = 0; + int rdfiles = 0; ASSERT(MUTEX_HELD(&lofi_lock)); @@ -1646,12 +1655,30 @@ file_to_lofi_nocheck(char *filename, struct lofi_state **lspp) if (lsp->ls_vp == vp) { if (lspp != NULL) *lspp = lsp; + if (lsp->ls_readonly) { + rdfiles++; + /* Skip if '-r' is specified */ + if (readonly) + continue; + } goto out; } } err = ENOENT; + /* + * If a filename is given as an argument for lofi_unmap, we shouldn't + * allow unmap if there are multiple read-only lofi devices associated + * with this file. + */ + if (lspp != NULL) { + if (rdfiles == 1) + err = 0; + else if (rdfiles > 1) + err = EBUSY; + } + out: if (vp != NULL) VN_RELE(vp); @@ -1663,13 +1690,13 @@ out: * it. */ static int -file_to_lofi(char *filename, struct lofi_state **lspp) +file_to_lofi(char *filename, boolean_t readonly, struct lofi_state **lspp) { int err = 0; ASSERT(MUTEX_HELD(&lofi_lock)); - if ((err = file_to_lofi_nocheck(filename, lspp)) != 0) + if ((err = file_to_lofi_nocheck(filename, readonly, lspp)) != 0) return (err); if ((err = lofi_access(*lspp)) != 0) @@ -2122,7 +2149,8 @@ lofi_map_file(dev_t dev, struct lofi_ioctl *ulip, int pickminor, } mutex_exit(&curproc->p_lock); - if (file_to_lofi_nocheck(klip->li_filename, NULL) == 0) { + if (file_to_lofi_nocheck(klip->li_filename, klip->li_readonly, + NULL) == 0) { error = EBUSY; goto err; } @@ -2243,6 +2271,8 @@ lofi_map_file(dev_t dev, struct lofi_ioctl *ulip, int pickminor, lsp->ls_kstat->ks_lock = &lsp->ls_kstat_lock; kstat_zone_add(lsp->ls_kstat, GLOBAL_ZONEID); + lsp->ls_readonly = klip->li_readonly; + if ((error = lofi_init_crypto(lsp, klip)) != 0) goto err; @@ -2343,7 +2373,8 @@ lofi_unmap_file(struct lofi_ioctl *ulip, int byfilename, mutex_enter(&lofi_lock); if (byfilename) { - if ((err = file_to_lofi(klip->li_filename, &lsp)) != 0) { + if ((err = file_to_lofi(klip->li_filename, klip->li_readonly, + &lsp)) != 0) { mutex_exit(&lofi_lock); return (err); } @@ -2460,6 +2491,8 @@ lofi_get_info(dev_t dev, struct lofi_ioctl *ulip, int which, sizeof (klip->li_filename)); } + klip->li_readonly = lsp->ls_readonly; + (void) strlcpy(klip->li_algorithm, lsp->ls_comp_algorithm, sizeof (klip->li_algorithm)); klip->li_crypto_enabled = lsp->ls_crypto_enabled; @@ -2469,7 +2502,8 @@ lofi_get_info(dev_t dev, struct lofi_ioctl *ulip, int which, return (error); case LOFI_GET_MINOR: mutex_enter(&lofi_lock); - error = file_to_lofi(klip->li_filename, &lsp); + error = file_to_lofi(klip->li_filename, + klip->li_readonly, &lsp); if (error == 0) klip->li_minor = getminor(lsp->ls_dev); mutex_exit(&lofi_lock); @@ -2481,7 +2515,8 @@ lofi_get_info(dev_t dev, struct lofi_ioctl *ulip, int which, return (error); case LOFI_CHECK_COMPRESSED: mutex_enter(&lofi_lock); - error = file_to_lofi(klip->li_filename, &lsp); + error = file_to_lofi(klip->li_filename, + klip->li_readonly, &lsp); if (error != 0) { mutex_exit(&lofi_lock); free_lofi_ioctl(klip); |