X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fufs%2Fsuper.c;h=584cf12cc40fb9874c2815e1585e79944cb84c83;hb=8c3478a523a48470eb11a23f01249250684677d9;hp=19a99726e58dd7fbaf00f2bb17bbe3a8764503fe;hpb=6ab3d5624e172c553004ecc862bfeac16d9d68b7;p=safe%2Fjmp%2Flinux-2.6 diff --git a/fs/ufs/super.c b/fs/ufs/super.c index 19a9972..584cf12 100644 --- a/fs/ufs/super.c +++ b/fs/ufs/super.c @@ -61,6 +61,8 @@ * UFS2 (of FreeBSD 5.x) support added by * Niraj Kumar , Jan 2004 * + * UFS2 write support added by + * Evgeniy Dushistov , 2007 */ @@ -85,7 +87,11 @@ #include #include #include +#include +#include +#include +#include "ufs.h" #include "swab.h" #include "util.h" @@ -93,14 +99,16 @@ /* * Print contents of ufs_super_block, useful for debugging */ -static void ufs_print_super_stuff(struct super_block *sb, unsigned flags, +static void ufs_print_super_stuff(struct super_block *sb, struct ufs_super_block_first *usb1, struct ufs_super_block_second *usb2, struct ufs_super_block_third *usb3) { + u32 magic = fs32_to_cpu(sb, usb3->fs_magic); + printk("ufs_print_super_stuff\n"); - printk(" magic: 0x%x\n", fs32_to_cpu(sb, usb3->fs_magic)); - if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) { + printk(" magic: 0x%x\n", magic); + if (fs32_to_cpu(sb, usb3->fs_magic) == UFS2_MAGIC) { printk(" fs_size: %llu\n", (unsigned long long) fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_size)); printk(" fs_dsize: %llu\n", (unsigned long long) @@ -117,6 +125,12 @@ static void ufs_print_super_stuff(struct super_block *sb, unsigned flags, printk(" cs_nbfree(No of free blocks): %llu\n", (unsigned long long) fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_nbfree)); + printk(KERN_INFO" cs_nifree(Num of free inodes): %llu\n", + (unsigned long long) + fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nifree)); + printk(KERN_INFO" cs_nffree(Num of free frags): %llu\n", + (unsigned long long) + fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nffree)); } else { printk(" sblkno: %u\n", fs32_to_cpu(sb, usb1->fs_sblkno)); printk(" cblkno: %u\n", fs32_to_cpu(sb, usb1->fs_cblkno)); @@ -199,11 +213,11 @@ static void ufs_print_cylinder_stuff(struct super_block *sb, printk("\n"); } #else -# define ufs_print_super_stuff(sb, flags, usb1, usb2, usb3) /**/ +# define ufs_print_super_stuff(sb, usb1, usb2, usb3) /**/ # define ufs_print_cylinder_stuff(sb, cg) /**/ #endif /* CONFIG_UFS_DEBUG */ -static struct super_operations ufs_super_ops; +static const struct super_operations ufs_super_ops; static char error_buf[1024]; @@ -224,7 +238,7 @@ void ufs_error (struct super_block * sb, const char * function, sb->s_flags |= MS_RDONLY; } va_start (args, fmt); - vsprintf (error_buf, fmt, args); + vsnprintf (error_buf, sizeof(error_buf), fmt, args); va_end (args); switch (UFS_SB(sb)->s_mount_opt & UFS_MOUNT_ONERROR) { case UFS_MOUNT_ONERROR_PANIC: @@ -255,7 +269,7 @@ void ufs_panic (struct super_block * sb, const char * function, sb->s_dirt = 1; } va_start (args, fmt); - vsprintf (error_buf, fmt, args); + vsnprintf (error_buf, sizeof(error_buf), fmt, args); va_end (args); sb->s_flags |= MS_RDONLY; printk (KERN_CRIT "UFS-fs panic (device %s): %s: %s\n", @@ -268,23 +282,35 @@ void ufs_warning (struct super_block * sb, const char * function, va_list args; va_start (args, fmt); - vsprintf (error_buf, fmt, args); + vsnprintf (error_buf, sizeof(error_buf), fmt, args); va_end (args); printk (KERN_WARNING "UFS-fs warning (device %s): %s: %s\n", sb->s_id, function, error_buf); } enum { - Opt_type_old, Opt_type_sunx86, Opt_type_sun, Opt_type_44bsd, - Opt_type_ufs2, Opt_type_hp, Opt_type_nextstepcd, Opt_type_nextstep, - Opt_type_openstep, Opt_onerror_panic, Opt_onerror_lock, - Opt_onerror_umount, Opt_onerror_repair, Opt_err + Opt_type_old = UFS_MOUNT_UFSTYPE_OLD, + Opt_type_sunx86 = UFS_MOUNT_UFSTYPE_SUNx86, + Opt_type_sun = UFS_MOUNT_UFSTYPE_SUN, + Opt_type_sunos = UFS_MOUNT_UFSTYPE_SUNOS, + Opt_type_44bsd = UFS_MOUNT_UFSTYPE_44BSD, + Opt_type_ufs2 = UFS_MOUNT_UFSTYPE_UFS2, + Opt_type_hp = UFS_MOUNT_UFSTYPE_HP, + Opt_type_nextstepcd = UFS_MOUNT_UFSTYPE_NEXTSTEP_CD, + Opt_type_nextstep = UFS_MOUNT_UFSTYPE_NEXTSTEP, + Opt_type_openstep = UFS_MOUNT_UFSTYPE_OPENSTEP, + Opt_onerror_panic = UFS_MOUNT_ONERROR_PANIC, + Opt_onerror_lock = UFS_MOUNT_ONERROR_LOCK, + Opt_onerror_umount = UFS_MOUNT_ONERROR_UMOUNT, + Opt_onerror_repair = UFS_MOUNT_ONERROR_REPAIR, + Opt_err }; static match_table_t tokens = { {Opt_type_old, "ufstype=old"}, {Opt_type_sunx86, "ufstype=sunx86"}, {Opt_type_sun, "ufstype=sun"}, + {Opt_type_sunos, "ufstype=sunos"}, {Opt_type_44bsd, "ufstype=44bsd"}, {Opt_type_ufs2, "ufstype=ufs2"}, {Opt_type_ufs2, "ufstype=5xbsd"}, @@ -292,6 +318,7 @@ static match_table_t tokens = { {Opt_type_nextstepcd, "ufstype=nextstep-cd"}, {Opt_type_nextstep, "ufstype=nextstep"}, {Opt_type_openstep, "ufstype=openstep"}, +/*end of possible ufs types */ {Opt_onerror_panic, "onerror=panic"}, {Opt_onerror_lock, "onerror=lock"}, {Opt_onerror_umount, "onerror=umount"}, @@ -328,6 +355,10 @@ static int ufs_parse_options (char * options, unsigned * mount_options) ufs_clear_opt (*mount_options, UFSTYPE); ufs_set_opt (*mount_options, UFSTYPE_SUN); break; + case Opt_type_sunos: + ufs_clear_opt(*mount_options, UFSTYPE); + ufs_set_opt(*mount_options, UFSTYPE_SUNOS); + break; case Opt_type_44bsd: ufs_clear_opt (*mount_options, UFSTYPE); ufs_set_opt (*mount_options, UFSTYPE_44BSD); @@ -422,7 +453,6 @@ static int ufs_read_cylinder_structures(struct super_block *sb) { struct ufs_sb_info *sbi = UFS_SB(sb); struct ufs_sb_private_info *uspi = sbi->s_uspi; - unsigned flags = sbi->s_flags; struct ufs_buffer_head * ubh; unsigned char * base, * space; unsigned size, blks, i; @@ -446,11 +476,7 @@ static int ufs_read_cylinder_structures(struct super_block *sb) if (i + uspi->s_fpb > blks) size = (blks - i) * uspi->s_fsize; - if ((flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) - ubh = ubh_bread(sb, - fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_csaddr) + i, size); - else - ubh = ubh_bread(sb, uspi->s_csaddr + i, size); + ubh = ubh_bread(sb, uspi->s_csaddr + i, size); if (!ubh) goto failed; @@ -545,6 +571,7 @@ static void ufs_put_cstotal(struct super_block *sb) cpu_to_fs32(sb, uspi->cs_total.cs_nffree); } ubh_mark_buffer_dirty(USPI_UBH(uspi)); + ufs_print_super_stuff(sb, usb1, usb2, usb3); UFSD("EXIT\n"); } @@ -572,7 +599,9 @@ static void ufs_put_super_internal(struct super_block *sb) size = uspi->s_bsize; if (i + uspi->s_fpb > blks) size = (blks - i) * uspi->s_fsize; + ubh = ubh_bread(sb, uspi->s_csaddr + i, size); + ubh_memcpyubh (ubh, space, size); space += size; ubh_mark_buffer_uptodate (ubh, 1); @@ -611,11 +640,10 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent) UFSD("ENTER\n"); - sbi = kmalloc(sizeof(struct ufs_sb_info), GFP_KERNEL); + sbi = kzalloc(sizeof(struct ufs_sb_info), GFP_KERNEL); if (!sbi) goto failed_nomem; sb->s_fs_info = sbi; - memset(sbi, 0, sizeof(struct ufs_sb_info)); UFSD("flag %u\n", (int)(sb->s_flags & MS_RDONLY)); @@ -646,11 +674,11 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent) ufs_set_opt (sbi->s_mount_opt, UFSTYPE_OLD); } - sbi->s_uspi = uspi = - kmalloc (sizeof(struct ufs_sb_private_info), GFP_KERNEL); + uspi = kzalloc(sizeof(struct ufs_sb_private_info), GFP_KERNEL); + sbi->s_uspi = uspi; if (!uspi) goto failed; - + uspi->s_dirblksize = UFS_SECTOR_SIZE; super_block_offset=UFS_SBLOCK; /* Keep 2Gig file limit. Some UFS variants need to override @@ -675,10 +703,6 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent) uspi->s_sbsize = super_block_size = 1536; uspi->s_sbbase = 0; flags |= UFS_TYPE_UFS2 | UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD; - if (!(sb->s_flags & MS_RDONLY)) { - printk(KERN_INFO "ufstype=ufs2 is supported read-only\n"); - sb->s_flags |= MS_RDONLY; - } break; case UFS_MOUNT_UFSTYPE_SUN: @@ -688,10 +712,22 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent) uspi->s_fshift = 10; uspi->s_sbsize = super_block_size = 2048; uspi->s_sbbase = 0; - uspi->s_maxsymlinklen = 56; + uspi->s_maxsymlinklen = 0; /* Not supported on disk */ flags |= UFS_DE_OLD | UFS_UID_EFT | UFS_ST_SUN | UFS_CG_SUN; break; + case UFS_MOUNT_UFSTYPE_SUNOS: + UFSD(("ufstype=sunos\n")) + uspi->s_fsize = block_size = 1024; + uspi->s_fmask = ~(1024 - 1); + uspi->s_fshift = 10; + uspi->s_sbsize = 2048; + super_block_size = 2048; + uspi->s_sbbase = 0; + uspi->s_maxsymlinklen = 0; /* Not supported on disk */ + flags |= UFS_DE_OLD | UFS_UID_OLD | UFS_ST_SUNOS | UFS_CG_SUN; + break; + case UFS_MOUNT_UFSTYPE_SUNx86: UFSD("ufstype=sunx86\n"); uspi->s_fsize = block_size = 1024; @@ -699,7 +735,7 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent) uspi->s_fshift = 10; uspi->s_sbsize = super_block_size = 2048; uspi->s_sbbase = 0; - uspi->s_maxsymlinklen = 56; + uspi->s_maxsymlinklen = 0; /* Not supported on disk */ flags |= UFS_DE_OLD | UFS_UID_EFT | UFS_ST_SUNx86 | UFS_CG_SUN; break; @@ -719,6 +755,7 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent) break; case UFS_MOUNT_UFSTYPE_NEXTSTEP: + /*TODO: check may be we need set special dir block size?*/ UFSD("ufstype=nextstep\n"); uspi->s_fsize = block_size = 1024; uspi->s_fmask = ~(1024 - 1); @@ -734,6 +771,7 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent) break; case UFS_MOUNT_UFSTYPE_NEXTSTEP_CD: + /*TODO: check may be we need set special dir block size?*/ UFSD("ufstype=nextstep-cd\n"); uspi->s_fsize = block_size = 2048; uspi->s_fmask = ~(2048 - 1); @@ -755,6 +793,7 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent) uspi->s_fshift = 10; uspi->s_sbsize = super_block_size = 2048; uspi->s_sbbase = 0; + uspi->s_dirblksize = 1024; flags |= UFS_DE_44BSD | UFS_UID_44BSD | UFS_ST_44BSD | UFS_CG_44BSD; if (!(sb->s_flags & MS_RDONLY)) { if (!silent) @@ -798,11 +837,18 @@ again: if (!ubh) goto failed; - usb1 = ubh_get_usb_first(uspi); usb2 = ubh_get_usb_second(uspi); usb3 = ubh_get_usb_third(uspi); + /* Sort out mod used on SunOS 4.1.3 for fs_state */ + uspi->s_postblformat = fs32_to_cpu(sb, usb3->fs_postblformat); + if (((flags & UFS_ST_MASK) == UFS_ST_SUNOS) && + (uspi->s_postblformat != UFS_42POSTBLFMT)) { + flags &= ~UFS_ST_MASK; + flags |= UFS_ST_SUN; + } + /* * Check ufs magic number */ @@ -848,7 +894,7 @@ magic_found: uspi->s_fmask = fs32_to_cpu(sb, usb1->fs_fmask); uspi->s_fshift = fs32_to_cpu(sb, usb1->fs_fshift); - if (uspi->s_fsize & (uspi->s_fsize - 1)) { + if (!is_power_of_2(uspi->s_fsize)) { printk(KERN_ERR "ufs_read_super: fragment size %u is not a power of 2\n", uspi->s_fsize); goto failed; @@ -863,7 +909,7 @@ magic_found: uspi->s_fsize); goto failed; } - if (uspi->s_bsize & (uspi->s_bsize - 1)) { + if (!is_power_of_2(uspi->s_bsize)) { printk(KERN_ERR "ufs_read_super: block size %u is not a power of 2\n", uspi->s_bsize); goto failed; @@ -887,18 +933,20 @@ magic_found: goto again; } - - ufs_print_super_stuff(sb, flags, usb1, usb2, usb3); + /* Set sbi->s_flags here, used by ufs_get_fs_state() below */ + sbi->s_flags = flags; + ufs_print_super_stuff(sb, usb1, usb2, usb3); /* * Check, if file system was correctly unmounted. * If not, make it read only. */ - if (((flags & UFS_ST_MASK) == UFS_ST_44BSD) || - ((flags & UFS_ST_MASK) == UFS_ST_OLD) || - (((flags & UFS_ST_MASK) == UFS_ST_SUN || - (flags & UFS_ST_MASK) == UFS_ST_SUNx86) && - (ufs_get_fs_state(sb, usb1, usb3) == (UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time))))) { + if ((((flags & UFS_ST_MASK) == UFS_ST_44BSD) || + ((flags & UFS_ST_MASK) == UFS_ST_OLD) || + ((flags & UFS_ST_MASK) == UFS_ST_SUN) || + ((flags & UFS_ST_MASK) == UFS_ST_SUNOS) || + ((flags & UFS_ST_MASK) == UFS_ST_SUNx86)) && + (ufs_get_fs_state(sb, usb1, usb3) == (UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time)))) { switch(usb1->fs_clean) { case UFS_FSCLEAN: UFSD("fs is clean\n"); @@ -971,7 +1019,12 @@ magic_found: uspi->s_npsect = ufs_get_fs_npsect(sb, usb1, usb3); uspi->s_interleave = fs32_to_cpu(sb, usb1->fs_interleave); uspi->s_trackskew = fs32_to_cpu(sb, usb1->fs_trackskew); - uspi->s_csaddr = fs32_to_cpu(sb, usb1->fs_csaddr); + + if (uspi->fs_magic == UFS2_MAGIC) + uspi->s_csaddr = fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_csaddr); + else + uspi->s_csaddr = fs32_to_cpu(sb, usb1->fs_csaddr); + uspi->s_cssize = fs32_to_cpu(sb, usb1->fs_cssize); uspi->s_cgsize = fs32_to_cpu(sb, usb1->fs_cgsize); uspi->s_ntrak = fs32_to_cpu(sb, usb1->fs_ntrak); @@ -983,7 +1036,6 @@ magic_found: uspi->s_contigsumsize = fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_contigsumsize); uspi->s_qbmask = ufs_get_fs_qbmask(sb, usb3); uspi->s_qfmask = ufs_get_fs_qfmask(sb, usb3); - uspi->s_postblformat = fs32_to_cpu(sb, usb3->fs_postblformat); uspi->s_nrpos = fs32_to_cpu(sb, usb3->fs_nrpos); uspi->s_postbloff = fs32_to_cpu(sb, usb3->fs_postbloff); uspi->s_rotbloff = fs32_to_cpu(sb, usb3->fs_rotbloff); @@ -1013,8 +1065,6 @@ magic_found: UFS_MOUNT_UFSTYPE_44BSD) uspi->s_maxsymlinklen = fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_maxsymlinklen); - - sbi->s_flags = flags; inode = iget(sb, UFS_ROOTINO); if (!inode || is_bad_inode(inode)) @@ -1058,7 +1108,6 @@ static void ufs_write_super(struct super_block *sb) unsigned flags; lock_kernel(); - UFSD("ENTER\n"); flags = UFS_SB(sb)->s_flags; uspi = UFS_SB(sb)->s_uspi; @@ -1068,6 +1117,7 @@ static void ufs_write_super(struct super_block *sb) if (!(sb->s_flags & MS_RDONLY)) { usb1->fs_time = cpu_to_fs32(sb, get_seconds()); if ((flags & UFS_ST_MASK) == UFS_ST_SUN + || (flags & UFS_ST_MASK) == UFS_ST_SUNOS || (flags & UFS_ST_MASK) == UFS_ST_SUNx86) ufs_set_fs_state(sb, usb1, usb3, UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time)); @@ -1137,6 +1187,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data) ufs_put_super_internal(sb); usb1->fs_time = cpu_to_fs32(sb, get_seconds()); if ((flags & UFS_ST_MASK) == UFS_ST_SUN + || (flags & UFS_ST_MASK) == UFS_ST_SUNOS || (flags & UFS_ST_MASK) == UFS_ST_SUNx86) ufs_set_fs_state(sb, usb1, usb3, UFS_FSOK - fs32_to_cpu(sb, usb1->fs_time)); @@ -1153,8 +1204,10 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data) return -EINVAL; #else if (ufstype != UFS_MOUNT_UFSTYPE_SUN && + ufstype != UFS_MOUNT_UFSTYPE_SUNOS && ufstype != UFS_MOUNT_UFSTYPE_44BSD && - ufstype != UFS_MOUNT_UFSTYPE_SUNx86) { + ufstype != UFS_MOUNT_UFSTYPE_SUNx86 && + ufstype != UFS_MOUNT_UFSTYPE_UFS2) { printk("this ufstype is read-only supported\n"); return -EINVAL; } @@ -1169,6 +1222,26 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data) return 0; } +static int ufs_show_options(struct seq_file *seq, struct vfsmount *vfs) +{ + struct ufs_sb_info *sbi = UFS_SB(vfs->mnt_sb); + unsigned mval = sbi->s_mount_opt & UFS_MOUNT_UFSTYPE; + struct match_token *tp = tokens; + + while (tp->token != Opt_onerror_panic && tp->token != mval) + ++tp; + BUG_ON(tp->token == Opt_onerror_panic); + seq_printf(seq, ",%s", tp->pattern); + + mval = sbi->s_mount_opt & UFS_MOUNT_ONERROR; + while (tp->token != Opt_err && tp->token != mval) + ++tp; + BUG_ON(tp->token == Opt_err); + seq_printf(seq, ",%s", tp->pattern); + + return 0; +} + static int ufs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct super_block *sb = dentry->d_sb; @@ -1205,12 +1278,12 @@ static int ufs_statfs(struct dentry *dentry, struct kstatfs *buf) return 0; } -static kmem_cache_t * ufs_inode_cachep; +static struct kmem_cache * ufs_inode_cachep; static struct inode *ufs_alloc_inode(struct super_block *sb) { struct ufs_inode_info *ei; - ei = (struct ufs_inode_info *)kmem_cache_alloc(ufs_inode_cachep, SLAB_KERNEL); + ei = (struct ufs_inode_info *)kmem_cache_alloc(ufs_inode_cachep, GFP_KERNEL); if (!ei) return NULL; ei->vfs_inode.i_version = 1; @@ -1222,22 +1295,20 @@ static void ufs_destroy_inode(struct inode *inode) kmem_cache_free(ufs_inode_cachep, UFS_I(inode)); } -static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) +static void init_once(struct kmem_cache * cachep, void *foo) { struct ufs_inode_info *ei = (struct ufs_inode_info *) foo; - if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == - SLAB_CTOR_CONSTRUCTOR) - inode_init_once(&ei->vfs_inode); + inode_init_once(&ei->vfs_inode); } - + static int init_inodecache(void) { ufs_inode_cachep = kmem_cache_create("ufs_inode_cache", sizeof(struct ufs_inode_info), 0, (SLAB_RECLAIM_ACCOUNT| SLAB_MEM_SPREAD), - init_once, NULL); + init_once); if (ufs_inode_cachep == NULL) return -ENOMEM; return 0; @@ -1245,8 +1316,7 @@ static int init_inodecache(void) static void destroy_inodecache(void) { - if (kmem_cache_destroy(ufs_inode_cachep)) - printk(KERN_INFO "ufs_inode_cache: not all structures were freed\n"); + kmem_cache_destroy(ufs_inode_cachep); } #ifdef CONFIG_QUOTA @@ -1254,7 +1324,7 @@ static ssize_t ufs_quota_read(struct super_block *, int, char *,size_t, loff_t); static ssize_t ufs_quota_write(struct super_block *, int, const char *, size_t, loff_t); #endif -static struct super_operations ufs_super_ops = { +static const struct super_operations ufs_super_ops = { .alloc_inode = ufs_alloc_inode, .destroy_inode = ufs_destroy_inode, .read_inode = ufs_read_inode, @@ -1264,6 +1334,7 @@ static struct super_operations ufs_super_ops = { .write_super = ufs_write_super, .statfs = ufs_statfs, .remount_fs = ufs_remount, + .show_options = ufs_show_options, #ifdef CONFIG_QUOTA .quota_read = ufs_quota_read, .quota_write = ufs_quota_write, @@ -1326,7 +1397,7 @@ static ssize_t ufs_quota_write(struct super_block *sb, int type, size_t towrite = len; struct buffer_head *bh; - mutex_lock(&inode->i_mutex); + mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); while (towrite > 0) { tocopy = sb->s_blocksize - offset < towrite ? sb->s_blocksize - offset : towrite;